LECTURE NO. 24
THE ETHER - AN ASSESSMENT
Copyright © Harold Aspden, 1998
INTRODUCTION
The above is the title of an article of mine
which appeared in the October 1982 issue of Wireless World. I wrote it
because I had noticed that the Editor of that popular periodical was not averse
to the idea that radio waves might well be waves propagated through the ether.
He was not intent on suppressing opinions that put the ether on the winning side
of the ever-ongoing debate concerning the relative merits of ether theory versus
Einstein's theory.
Unlike so many editors of physics periodicals, who see
it as a duty to censor all that they publish to ensure at all times an absolute
adherence to the Einstein doctrine, here was an Editor who saw that those who
read Wireless World enjoyed witnessing and indeed participating in the contest,
the object of which was to glean the truth concerning the medium in which radio
waves propagate.
After all, Einstein's theory is of no practical use in
technology, but the technology of radio communication and the energy transfer
processes which are involved in high frequency wave transmission has been
developed by those who saw Maxwell's theory as a foundation on which to
build.
Here, the operative word is 'build', not 'destroy', and it is no
comfort to be told that Einstein developed his mathematical, but abstract,
picture of 'space-time', in just such a way as to leave Maxwell's equations
intact, notwithstanding the distortions introduced by 'four-space'
transformations.
How can it be that those involved in the early days of
radio technology, just as they were getting the measure of what was involved in
radio propagation, were suddenly expected to deny their belief in the existence
of the ether and adjust to a new philosophy? This was a philosophy which said:
"If you cannot understand why something you think should happen but yet does not
happen, then think about it in a different way and pretend it does happen!
Transform your viewpoint and look at the problem from a different angle, one
where you are the governing authority from which all physical action takes its
reference, so that you will always see things in the same light and with
reference to that something wiser beings once called the 'ether'."
Well,
thankfully, the Editor of Wireless World, saw the 'world' as one in which one
can communicate by acting collectively by allowing the electromagnetic waves
which they generate to be pooled in the common sea of energy that constitutes
the real 'ether' medium. Given that as one's foundation then one can take
Maxwell's equations and think about building on the common foundation that
supports those equations, rather than destroying the foundation and then saying
that Maxwell's ghost is still there asserting influence - subject, of course, to
that ghost not doing anything contrary to Einstein doctrine.
So it was
that I came to pay attention to three articles which appeared in Wireless World
and I saw my chance to offer the Editor my paper of the above title: The
Ether - An Assessment. Now let me say at the outset that I wrote the paper,
not intending to play an old classical tune, but rather to show where
opportunities had been missed when it came to interpreting the observed facts
which feature in this scenario.
I could see how there was error in
deriving the Larmor formula for energy radiated by the accelerated electron. I
could see that there was error in deriving what is known as the 'Poynting
Vector'. I could see that there was error in explaining how electric currents
set up actions which inject energy into the vacuum as a so-called magnetic
field, energy which is 100% recoverable, but yet letting the explanation ride
exclusively on empirical formulations without giving any physical causal basis
justifying why those equations work. I could see there was error in assuming
that the ether could not sustain distortionless signal propagation, an
assumption relied upon at their peril by cosmologists who interpret Hubble
distances on such false assumptions. In this latter context I could but assume
that they had not heeded Heaviside's success in inventing the distortionless
transmission line and so had not seen that Heaviside was merely replicating
something Nature had provided as a feature of the ether. I could, further, see
where Lorentz had erred in interpreting the Michelson-Morley experiment
incorrectly and with it the Trouton-Noble experiment, an experiment of far
greater importance, thereby opening the door for Einstein. I could see that
those of us interested in electromagnetic waves, as real ether waves, and in
learning also about the properties of stationary waves, as set up by
reflections, had been left in the dark by physicists who did not trouble to
apply standing wave theory to their opinions concerning the Michelson-Morley
experiment. I could see that here Michelson and Morley could be forgiven for not
taking such standing wave effects into account in setting the theory for their
experiment. The reason was that Wiener, the scientist who first discovered the
effect set up by standing waves, namely the phase-lock connection with mirror
surfaces, did not make that discovery until some years after Michelson-Morley
completed their experiments. However, how can we excuse those who let these
facts pass them by as if they were irrelevant when set alongside the Einstein
notion that light speed takes its reference, not from a mirror to which its
standing wave energy is locked, but from an observer sitting outside the test
apparatus and just looking at the light patterns of interfering
waves?
That, in summary, was why I decided to write the article of the
above title. I will now work through that article step by step and will amplify
the points made, by introducing links to other pages on this Web site, so as to
leave the reader in no doubt that the case against the Einstein doctrine is
formidable indeed. Conversely, the case in favour of a belief in the ether is
overwhelming in view of the enormous vista of new physics and, hopefully, new
technology, that one can then see.
THE DYING PATIENT
I hold firmly to the opinion that
Einstein's theory is defunct. It will, however, only pass away with the natural
passage of time as the diehards who are committed to the Einstein doctrine
themselves pass on to other pastures.
With that I introduce the cartoon
that the Editor of Wireless World commissioned based on my outline format and a
caption I worded. I have received permission to reproduce that cartoon and it
features also in the few copies of my work I had printed under the title:
Aether Science Papers.

THE ASSESSMENT BEGINS
Does the ether exist? Dr. Aspden shows that Oliver Heaviside's
insight could have pre-empted Einstein's success with the General Theory of
Relativity and encouraged investigations into the properties of the
ether.
Though 'Relativity' has very little bearing upon the
practical problems of radio transmission, it does preclude belief in the ether
and wave propagation as contemplated by Maxwell, leaving us with no tangible
alternative. Until we have a better understanding of the vacuum medium and the
way in which it regulates electromagnetic wave motion, it is likely that
Einstein's ideas will be questioned.
Essen, writing about relativity and
time signals (Wireless World, October 1978), and Wellard, writing about the work
of James Clerk Maxwell (Wireless World, March and May, 1981), both evoke this
controversy.
In fact, special relativity, which dates from 1905, has very
dubious support, because alternative explanation of E = Mc2 and mass
increase with speed is available from textbooks on classical electromagnetism
[1]. Besides, the transmutation of mass and energy, the basis of E =
Mc2, was recognized by Jeans, writing in 1904, one year before
Einstein introduced his theory [2]. How, then, can we have confidence in
relativity, when Essen demonstrates so convincingly the absurdity of expecting
time to pass at a different rate when perceived by different observers in
relative motion?
What should be stressed here is the fact that Dr. Louis
Essen was not one of those crackpot scientists that many physicists think of
when the belief in an ether is in issue. No, Dr. Essen was a Fellow of the Royal
Society who had earned recognition for his research on the measurement of time
and his invention of the atomic clock. He served at the National Physical
Laboratory in U.K. and, though it must have been somewhat embarrassing for that
government institution to see Dr. Essen going out of his way to deride
Einstein's notions about time dilation etc., he nevertheless persisted in
stating his opinions on that subject. So many academic physicists dare not
express a dissident opinion on the Einstein theme for fear that the funding
attracted by their universities would be put in jeopardy.
Einstein's
theory really depends, for its acceptance, principally upon the success of the
later 1916 General Theory of Relativity, which brought a slight modification to
Newton's Law of Gravitation. The successive elliptical orbits of the planet
Mercury were known to have a progressive advance, part of which was anomalous,
as judged from Newton's Law. Einstein's law gave the right answer and relativity
was thereby acclaimed.
Einstein made no reference to an earlier paper by
Paul Gerber [3], entitled 'The Space and Time Propagation of
Gravitation'. It appeared in 1898 in a leading German scientific
publication. So, one assumes that if Einstein had acquired some background
knowledge concerning the anomalous precession of the orbit of the planet
Mercury, he is likely to have seen Gerber's paper. If he did not, then it is
very curious to find that, some eighteen years after Gerber's paper issued, when
Einstein did write on the subject, he gave precisely the same formula for the
advance of Mercury's perihelion as that presented by Gerber. Now, by 'precise'
here I mean not just the same in mathematical terms, but precise in the choice
of parameters, their alphabetic notation and the case, upper or lower, that was
used by Gerber. I cannot believe there is coincidence in that choice, unless it
is that someone before Gerber had already published the formula in that form and
that had been seen by both Gerber and by Einstein, which means that there would
have to be an even earlier publication of the ultimate formula for rate of
planetary perihelion advance. Note that Einstein never acknowledged the prior
work of others. He was a genius in the eyes of some, but did they know where his
ideas came from?
Gerber's paper explained how the anomalous perihelion
motion of the planet could be explained by recognizing that gravitation
propagated at the speed of light. When Einstein's paper appeared in Ann. d.
Phys. in 1916, a colleague of Gerber arranged for the publication of an updated
version of Gerber's work in the 1917 issue of this same journal. Note that
Gerber, a schoolmaster, was then deceased, and so was unable to defend his
theory against attack. Given the challenge it posed to Einstein at the time, it
is no wonder that it attracted criticism. Sadly, in its detailed derivation of
the ultimate formula, it was in error; the direct propagation of gravitational
action between sun and planet at the speed of light, which Gerber assumed, only
gives a partial account of the anomaly. Even so there were several exchanges
recorded as Letters to the Editor in Ann. d. Phys. concerning that Gerber
proposition, and there were two sides to that debate.
Meanwhile, even
before the Gerber 1898 publication, as we may read from the opening passage of
Leon Brillouin's book , Relativity Reexamined [4], Heaviside, in 1893,
had pointed out that 'to form any notion at all of the flux of gravitational
energy, we must first localize the energy'. If this is taken to heart, it leads
us to recognize that the flow of gravitational energy is not directly along the
line between sun and planet, but is, of necessity, via a longer route. The
energy must flow from one of these bodies to the surrounding field and then from
the field to the other body. This modifies the resulting retardation of
gravitational action, as calculated in that 1898 Gerber paper, and affects the
perihelion motion accordingly. The result, as this author [5] has shown, is in
exact accord with that originally predicted by Gerber. In fact, Gerber had the
right answer but his paper combined a mathematical error with a slightly
incorrect assumption, whereas the adjusted assumption plus correct mathematical
analysis gives the same and correct answer, all without regard to the nonsense
introduced by Einstein's theory.

The above diagrams show the distribution of the field energy E
involved in the field interaction between two bodies as a function of distance
x from either body. The electric field energy [1979a]
is not deployed in the same manner as gravitational field energy [1980b].
The retardation in the action of gravity, as two bodies move relative to one
another, can therefore be calculated and its effect on the motion determined.
Based on conventional field theory, the corresponding diagram for the magnetic
field energy distribution [1980a]
is extremely complicated as it is a function of how the direction of motion of
charge may vary as well as their separation distance. It does not afford
meaningful results and is deemed irrelevant to the gravitational case, thereby
explaining why scientists adhering to the Lorentz force law have not been able
to unify the field actions of electromagnetism and gravitation. Bear in mind
that E in the gravitational case is really an energy deficit, owing to
gravitational potential being negative. One interesting way of then
interpreting the implications of the above two diagrams is to say that the
energy seeks deployment in the field away from the interacting bodies. This
means that the electric interaction between two charged bodies, deemed to be
of like polarity, develops a mutual repulsion. On the other hand, in the
gravitational case, the field energy, in trying to move away from the bodies,
brings the negative form closer to them and this implies mutual attraction.
Einstein's Law of Gravitation, the only significant consequence
of his General Relativity Theory, can be deduced by a simple classical analysis,
which exploits the intuitive remark of Oliver Heaviside dating from 1893. This,
in itself, does not prove that Einstein's theory is wrong. We do, however, have
viable alternative theory which is quite simple, and one must wait for the
experimental evidence to direct us on the right course. This evidence is likely
to come from measurements evidencing the properties of the ether. Already, in
1980, we have the experimental data of Graham and Lahoz [6] showing that the
ether can assert a force, and supporting Marwell. Burrows (Letter to the Editor,
Wireless World, October 1981) asserts that this is a one-off measurement needing
verification. It is nevertheless backed by the discovery that the Earth's cosmic
motion through space at a speed of some 400 km/s can be detected by measuring
anisotropy in the intensity of the 3K background radiation. (See article
entitled 'The Cosmic Background Radiation and the New Aether Drift' in
Scientific American, May 1978). Furthermore, as we shall see below, it is
supported by other evidence on electromagnetic-wave propagation suggesting that
the Earth's West-East motion due to its rotation can be directly measured as a
linear velocity by optical techniques.
A further note is interjected at this point to draw attention to
the very important evidence that has emerged from the experiments of Dave
Gieskieng on electromagnetic wave propagation involving a special radio
antenna [Lecture
No. 10: Appendix]. I believe that his findings show that the ether is
essential in that it accounts for the absorption and dissipation of the
propagating magnetic component of wave energy whilst sustaining a standing
wave electrical oscillation. Such findings further lead us to a symmetrical
form of Maxwell's equations, thereby providing a more plausible basis for
energy deployment activity in the ether itself. This is where justifiable
criticism can be levied at the theory of the Poynting vector. Onward analysis
on that theme will be necessary, but it is more important that physicists
should rethink their interpretation of what they call the 'photon'. As stated
elsewhere in these Web pages [Tutorial
No. 8], it is not a particle, being merely an 'event', that of an energy
transaction as between ether and matter.
On such a course, the ether
is destined for reacceptance and Einstein's theory will have to yield ground.
There is, therefore, purpose in reassessing the ether and its properties, and in
this quest we will again be mindful of Heaviside. It is to his great credit that
he discovered how to design a telegraph line capable of propagating signals
without distortion. The inductive and capacitative properties of a telegraph
line cause the speed of propagation to depend upon frequency. By appropriate
matching of these properties, as well as resistance and leakance, the attenuated
signal can propagate without distortion. Now, electromagnetic waves propagate
through the ether without distortion and, though the ether is not subject to
resistance and leakance, it does have inductance and capacitance, because there
are magnetic fields and electric fields in the vacuum.
Nature,
anticipating Heaviside's contribution to telegraphic communication, has provided
that extra something in the ether to secure distortionless signal propagation.
This becomes an important clue in our quest to understand more about the
ether.
Here I interject the comment that, if Heaviside had not invented
the distortionless transmission line and the physicists of this world had
drifted on in ignorance, as they have concerning the propagation properties of
the ether, then the natural philosophical assumption is that a transmission line
that can convey distortion free signals is not really there as a real physical
form. Evidently, since we know that there is distortion, meaning frequency
dispersion, when high frequency signals propagate through real media, then the
non-dispersion indication must be an indication that wave energy is travelling
through something that is not there. Einstein's theory would then have had to be
embraced by those who are interested in telegraphic communication and it would,
one must assume, have served as an obstruction to technological advance.
Fortunately, however, thanks to Heaviside's discovery, that obstruction has been
limited to the interpretation of signals from the remote galaxies in the
universe, seen erroneously as exhibiting a redshift indicative of an expanding
universe, rather than the action of an intervening medium in space which
attenuates signal strength.
However, thanks to Heaviside, we were saved
from that situation. Unfortunately, however, even though Heaviside declared that
one could not explain how gravity acts across a distance without first
localizing the energy involved, his message concerning gravitation was not
heeded. That message dates from 1893, some three years after Wiener discovered
those standing waves, but somehow physicists of the 1900 era missed their
opportunity to solve the gravitation mystery hidden in the anomalous motion of
Mercury's perihelion and they feel prone to the Einstein doctrine and the new
faith which then evolved.
For my part, there were other reasons which
convinced me that the ether is a real medium. Indeed, the Wireless World article
included an inset box, which contained my photograph together with a few words
about my background. These words included the following:
"Shortly after embarking on a career in the patent profession,
some 28 years ago (i.e. 1953), he (Dr. Aspden) had an idea on electromagnetic
reaction which intrigued him and led to the firm belief in the need for an
ether. Dr. Aspden has had success in his chosen career, having directed IBM's
European Patent Operations for the last 18 years, but his ambition is to
achieve success in his private quest to bring the ether back into favour. The
very substantial potential which Dr. Aspden sees in an ether is evident from
his book 'Physics Unified', published in 1980."
I
retired from IBM in May, 1983 seven months after this Wireless World article was
published, in order to concentrate on the latter effort.
WHY STUDY THE ETHER?
According to its dictionary definition,
'ether' is 'a medium, not matter, that has been assumed to fill all space and
transmit electromagnetic waves'. With such definition, the 'ether' remains valid
terminology. The problem which some scientists have in accepting the existence
of the ether arises from a further assumption that the ether cannot adapt to its
environment and so must regulate the constancy of the speed of fight in a
universal frame of reference. When motion of the Earth about the sun could not
be detected by speed of light measurements in the laboratory frame, the very
existence of the ether came under challenge. Yet what logic is there in saying
that A is believed to have property B, but we cannot detect property B, so A
does not exist? Surely, the only valid conclusion is that A may still exist but
it appears not to have property B.
Why bother? We have Maxwell's
equations and we have relativity. The latter tells us not to expect to detect
anything at all except according to physical laws which adapt to the reference
frame of an observer. Without an observer, whether real or hypothetical, there
can, in relativity, be no definitive physical phenomena. Hence we are supposed
to live in a somewhat abstract world and are encouraged not to seek to
understand the universal and uniform nature of whatever it is that permeates the
vacuum and regulates electromagnetic wave propagation.
I have good reason
for believing that a great deal of opportunity is being missed in scientific and
technological research by accepting doctrinaire theory and not keeping an open
mind on this ether question. For example, it is to the credit of those engaged
in precision measurement in fundamental physics that some constants can now be
determined to a few parts in 1012. Such precision defies imagination
if related to the measurement tasks we undertake domestically or in industry.
Yet, what is really fascinating is that Nature is actually able to regulate
physical quantities universally and hold them stable to such accuracy,
notwithstanding environmental fluctuations, wherever we in the universe. This
surely suggests a fundamental mechanism and a reference or control medium,
having a universal metric binding all matter together as part of a common
system. To me,this is the primary role of the so-called ether, with the light
propagation characteristic assuming secondary importance.
By postulating
an electric but neutral medium of the simplest possible kind and analyzing its
structure, as if it were a kind of invisible and elusive crystal extending
throughout space, the author [7], in collaboration with Dr D M Eagles of the
National Standards Laboratory in Australia, has found it possible to deduce
fundamental constants, notably:
to
the measured accuracy of less than one part per million. It is this that has
committed me to a course of scientific enquiry founded upon a positive belief in
the ether rather than a passive acceptance of a rather sterile theory of
relativity [Tutorial
No. 8] and [1972a].
In
the above expression, c is the electric charge of the electron, h is Planck's
constant and c is the speed of light in vacuo. Hence the dependence of the fine
structure constant upon the metric of the ether medium is very closely linked to
electromagnetic wave propagation, because:
This
is Planck's radiation law. It signifies that the energy propagated as
electromagnetic disturbances at the speed of light is packaged in units which
have energy E, given that the frequency is E/h.
It is a relatively simple
task to show that this structured vacuum medium which allows the precise value
of that fine structure constant to be determined theoretically and which, of
course, delivers the two physical formulae just presented, can accommodate to
the propagation properties of electromagnetic waves, and particularly on two
basic counts. These are: (a) the fact that the speed of propagation is referred
not to an absolute frame but to one which can adapt to the reference frame of an
Earthly observer and (b) the equally important fact that light travelling in
true vacuum suffers no dispersion resulting from its speed varying with
frequency.
From the optical characteristics of ionic crystals it is known
that there is dispersion, significant at frequencies in the vicinity of the
natural resonant frequency of the crystal. One should than bear in mind that
energy quanta of sufficient strength can induce the creation of
electron-positron pairs in the vacuum. This suggests that the ether sets a
critical frequency threshold (the Compton electron frequency) and so may have an
electrical structure conforming with this resonant frequency. Thus, in proposing
a kind of crystal structure for the vacuum medium and establishing, as I have
[7], that it has a natural frequency given by:
one
is led directly into the question of frequency dispersion.
Before dealing
with this, consider first the other problem. Michelson's experiments towards the
end of the 19th century have shown that the Earth itself determines the local
frame in which light has a speed c independent of direction. This is not in the
least surprising if we admit the vacuum medium to be electrically-structured.
Lorentz has shown that, according to classical electron theory, the speed of
light in matter depends upon electron density and the oscillation period of such
electrons in such material media. Electron density does not depend upon
rotation, nor is it a vector. therefore, the speed of light (as opposed to its
direction) should be unaffected by rotation. Hence, if there is any theoretical
connection or analogy between this situation in matter and what may govern the
speed of light in vacuum, the expectation must be that, in the laboratory
vacuum, the speed of light is referred to the Earth's inertial (non-rotating)
frame. An experiment aimed at detecting the Earth's rotation using optical
techniques referred to the vacuum should give a positive result.
Such an
experiment was performed by Michelson in 1925, confirming the classical
expectation from ether theory by sensing the Earth's rotation. Earlier, Sagnac
had sensed the rotation of optical apparatus by speed of light measurement, a
technique now applied in the ring-laser gyro. It is assumed that detection of
speed of rotation accords with relativity, owing to parts of the rotating
apparatus having motion relative to other parts. On the other hand, if such
experiments permit comparison of the speed of light East-West versus West-East
and afford linear speed difference, it is relativity that is in difficulty. With
the advance of optical measurement techniques, it should soon be possible to
resolve this question.
For translational motion with the Earth, the
vacuum structure acquires a linear displacement. Clearly, any displacement of
electric charge in the vacuum must be transitory and oscillatory, unless it is
balanced by a matching counterflow or reverse displacement of some of the charge
present. Otherwise there would be a steady build-up of charge and an
ever-increasing electric field. One may, therefore, visualize the vacuum as
having two charge structures capable of moving through one another in opposite
directions. This is quite possible because there are no rigid bonds between the
chargers, just electric field interactions.
It is this dual structure for
charge displacement that is the key. The primary structure moves forward with
the Earth. The secondary structure moves through the primary structure in the
reverse direction and, by analogy with an optical effect named after Fresnel, we
expect this reverse flow to affect the speed of light through the primary
structure. Fresnel's theory explains why the speed of light increases in
proportion to:
where
u is the velocity of the disturbing medium. This can be deduced from electron
theory, but it has been verified by experiments in which the speed of light
through moving water is measured.
Applying this same theory to the vacuum
itself, and recognizing the counter displacement, it is an easy matter to arrive
at the result discovered experimentally by the Michelson-Morley
observations.

We
do not need to appeal to relativity for an explanation of this basic
observation. The Michelson-Morley experiment verifies that Maxwell's electric
displacement theory can be a dual and reciprocal phenomenon. Oscillations of the
electrical structure of the vacuum can occur at the resonant Compton electron
frequency with no reverse motion of the secondary structure or
counter-displacement. However, we may expect light propagation at lower
frequencies to involve counter-displacement and it is this that brings a new and
important dimension to Maxwell's theory. With it comes a solution to the
dispersion problem.
Note that the frequency of an electromagnetic wave
has no meaning at a point in space and time. Frequency concerns rate of change
and this information implies comparison of signal strengths at two points in
time or two points in space. However, given dual displacement at a point in
space, as we now have in the theory just presented, the frequency can be
codified by the relative strengths of the two displacement
parameters.
The frequency of the signal is, in fact, preserved in transit
through the vacuum medium, because the medium propagates two electric
displacement signals in anti-phase, and the relative amplitude of the signal
strengths determines the frequency. As we shall now see, this involves the
vacuum adjusting to the signal in transit to adopt a locally-tuned condition
having the resonant frequency of the signal. The frequency at which
electron-position pair creation occurs is the limit frequency beyond which there
is no counter-displacement. However, the interesting point is that there is no
forced oscillation and so no dispersion characteristic in the vacuum, since the
vacuum adapts to any frequency and exhibits the properties of a tuned LC
system.

Such
analysis assures us that the vacuum medium does not forcibly respond to the
dynamic frequency characteristics of a signal. It propagates the primary and
secondary displacements and the local vacuum resonates at the optimum frequency
set by these displacements. In this way the signal frequency is preserved over
vast distances.
The dual electrical displacement suggested above greatly
strengthens the base on which one can develop a phenomenological ether theory
supporting Maxwell's equations. More important, however, it opens the path for
new avenues of research into the effects of energy absorption from
electromagnetic waves and their mutual interference. Meanwhile, note that
Einstein's E=Mc2, the keystone of special relativity and his law of
gravitation, the basis of his general relativity, have both succumbed to
alternative explanation [5-8].
It is likely to be in the optical
measurement field, involving speed of light tests in relation to Earth rotation,
that we may see the determining experiments, crucial to relativity. The Ether
will surely survive.
References
1. H. A. Wilson,'Modern Physics', 2nd. Ed.,
Blackie, 1946.
2. J. H. Jeans, Nature, v.70, p.101 (1904).
3. P. Gerber,
Zeitschrift f. Math. u. Phys., v.43, p.93 (1898).
4. L. Brillouin,
'Relativity Reexamined', Academic Press, 1970.
5. H. Aspden, J. Phys. A:
Math. Gen., v.13, p.3649 (1980).
6. G. M. Graham and D. H. Lahoz, Nature,
v.285, p.154 (1980).
7. H. Aspden and D. M. Eagles, Physics Letters, v.41A,
p.423 (1972).
8. H. Aspden, Int. Jour. Theor. Phys., v.15, p.631
(1976).
Harold Aspden