The following is a paper by H. Aspden published in Hadronic Journal, v. 10, pp. 185-192 (1987).
Abstract: In view of the very strong indications that the time rate of atomic clocks dilates in dependence upon motion relative to a preferred frame, an alternative to relativistic time dilation is needed. It is shown that atomic clock rates are affected by motion relative to the preferred frame, according to the synchronous lattice dynamics as used by the author to explain the nature of the photon and the elementary particle spectrum in recent Hadronic Journal papers.
The full text of this paper may also be seen in PDF format as Paper No. 5 in the author's 1996 book Aether Science Papers which is of record in the author's website http://www.haroldaspden.com.