Abstract
IN considering the self-energy problem on the basis of the multiple-time formalism of quantum electrodynamics, Wentzel1 has obtained the relation 
where mn(s) is the rest-mass of a field-free particle, mn the corresponding mass in an electromagnetic field and s the particle extension. If we now assume that mn(s) and mn refer to the masses of two fundamental particles M1 and M2 (expressed in terms of the electron mass m) it follows directly from equation (1) that 
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References
Wentzel, G., “Quantum Theory of Fields” (1949).
Harding, J. B., Phil. Mag., 41, 405 (1950).
Bethe, H. A., Rev. Mod. Phys., 8, 83 (1936).
Eddington, A. S., “Fundamental Theory” (Cambridge, 1948).
Konopinski, E. J., Phys. Rev., 72, 518 (1947).
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STEPHENSON, G. Masses of Fundamental Particles. Nature 166, 655–656 (1950). https://doi.org/10.1038/166655a0
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DOI: https://doi.org/10.1038/166655a0
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