The following is a paper by Harold Aspden published in
Physics Essays, volume 8, pp. 19-28 (1995).
'Retardation in the Coulomb Potential'
Abstract: The spatial
disposition of field energy owing to mutual interaction of two particles is
usually considered in retarded force interaction theories. Stimulated by a
comment from Allen [Physics Essays, v. 6, p. 614 (1993)], the author briefly
summarizes his own prior published analysis of the electrostatic,
electromagnetic, and gravitational field energy distributions and their bearing
on action-at-a-distance theories.
The full text of this paper may also be seen in PDF format as
Paper No. 14 in the the Appendix to the author's 1996 book Aether Science
Papers of record on the author's website http://www.haroldaspden.com.