The following is a paper by H. Aspden published in Hadronic Journal, v. 9, pp. 153-157 (1986).
Abstract: An alternative empirical approach, differing from the quark model, is presented for analysing particle constitution. It relies upon an energy correlation based upon the Thomson charge-mass formula and primary energy quanta, notably those of the proton (938 Mev), the related dimuon (211 Mev), and two graviton-related quanta, denoted g(2587 Mev) and g*(3259 Mev), respectively.
The full text of this paper may also be seen in PDF format as Paper No. 3 in the author's 1996 book Aether Science Papers which is of record in the author's website http://www.haroldaspden.com.