The following is a paper by H. Aspden published in Physics Letters, v. 111A, pp. 22-24 (1985).
Abstract: Recent experiments have highlighted anomalous electrodynamic forces in arc discharges in liquids, making it necessary to re-evaluate the fundamental principles governing the electrodynamic interaction. This letter shows that a solution is to be found in a classical quantum-electrodynamic and relativistic proposal outlined by Maxwell in his famous treatise.
Commentary: It is observed that Maxwell introduced the Fechner hypothesis by which electric current was seen as the flow of counter-moving charges of opposite polarity. Then, by adopting a mutual electromagnetic energy potential based on relative charge velocities, Maxwell deduced the Neumann potential.