The following is a paper by H. Aspden published in Hadronic Journal, v. 11, pp. 169-176 (1988).
Abstract: The proton/electron mass ratio and the proton magnetic moment measured in nuclear magnetons have values now known to a very high degree of precision. The only theory of record that gives physical reasoning which can account for these dimensionless numerical ratios is one reported in the Hadronic Journal in its extended application to the neutron and the deuteron. In view of the recent CODATA specification of the proton constants, which is of higher precision than was known when the proton theory was first published, it is appropriate to review that theory and present it in a simplified and updated form. It is found that the theory remains viable, notwithstanding the stringent demands imposed by the measurement data.
The full text of this paper may also be seen in PDF format as Paper No. 11 in the author's 1996 book Aether Science Papers which is of record in the author's website www.aspden.org.