From Citizendium, the Citizens' Compendium
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- The Biot-Savart law can be derived as a special case from the more general Lienard-Wiechert potentials, and applies to point charges only when they are moving at constant, non-relativistic velocities. See Harald J. W. Müller-Kirsten (2004). “§10.4 The fields E, B of a moving point charge”, Electrodynamics: an introduction including quantum effects. World Scientific, p. 223. ISBN 9812388087. and Robert Joseph Gould (2006). “§2.4.2: Charge in uniform motion”, Electromagnetic processes. Princeton University Press. ISBN 0691124442.
- The application of classical analysis to non-point charges, with an extensive history of such calculations, is found in Arthur D. Yaghjian. Relativistic dynamics of a charged sphere: updating the Lorentz-Abraham model, Revised 1992 ed. Gulf Professional Publishing. ISBN 0387260218.
- Further discussion of the historical problems with point particles is found in : Herbert Spohn (2004). “Chapter 3: Historical notes”, Dynamics of charged particles and their radiation field. Cambridge University Press. ISBN 0521836972.