The following is a paper by H. Aspden published in Lettere al Nuovo Cimento, v. 37, pp. 210-214 (1983).
Abstract: A quark-like model of the muon based upon the Thomson formula for the electron is correlated with a recent account of the muon g-factor and shown to determine the muon-electron mass ratio. The theory indicates that this is 206.6787, in close accord with its measured value. The model involves a resonance governed by the period at which a disturbance propagates around the electron charge, the radius being the same as that of the de Sitter micro-universe model of the electron suggested by Caldirola.
Commentary: Readers should understand that the author's aether theory revealed that the vacuum energy sea comprises 'virtual' muons, meaning muons of a primordial form that only exist in that subtle medium we are terming 'aether'. Such virtual muons have a calculable energy in relation to rest-mass energy of a real muon. It is 206.3329. The author had to confront the problem of reconciling this with the mass of the real muon and the subject paper develops that theme.