Ja. Heras, TIME-DEPENDENT GENERALIZATIONS OF THE BIOT-SAVART AND COULOMB LAWS - A FORMAL DERIVATION, American journal of physics, 63(10), 1995, pp. 928-932
A formal derivation of Jefimenko's formulas for the time-dependent gen
eralizations of the Biot-Savart and Coulomb laws is presented. Maxwell
's equations and the free-space retarded Green function for the scalar
wave equation are the basic ingredients of this derivation. (C) 1995
American Association of Physics Teachers.