Turkish Journal of Physics
In the framework of classical electrodynamics elementary particles are treated as capacitors. The electrostatic potentials satisfy equations of the Schrödinger type. An interesting "quantization condition" for elementary charges is derived.
KAPUSCIK, EDWARD and WIDOMSKI, MACIEJ (1999) "Elementary charges in classical electrodynamics," Turkish Journal of Physics: Vol. 23: No. 5, Article 5. Available at: https://journals.tubitak.gov.tr/physics/vol23/iss5/5