The following two articles published in the Journal- AIP Advances (March 2011) suggest a classical mathematical model for a basic particle electron, by studying the requirements of Quantum Mechanics and Special Relativity. The model is then expected to give same results in a mathematical analysis as obtained by experiments and suggested by these theories. They are available in the Review Section:
1. Mathematical Model I. Electron and quantum mechanics
https://physicsoverflow.org/45309/mathematical-model-i-electron-and-quantum-mechanics
2. Mathematical model II. Basic particle and special relativity
https://physicsoverflow.org/45308/mathematical-model-basic-particle-and-special-relativity
The main LIMITATIONS of the approach are:
a). We need a complete and well defined system to generate any classical model of a physical reality.
b). The model of a basic particle can be relative to another particle, with which it interacts. Say, electron as seen by proton, in a Hydrogen atom. The human observer’s role is limited to observing the effects of interaction within these two particles, such as emission of a photon, using his measuring instruments. The concept of describing a classical model of the basic particle as seen by the human observer needs to be discarded.