1. H. A. Lorentz:The Theory of Electrons and its Applications to Phenomena of Light and Radiant Heat (B. G. Teubner, Leipzig, 1909).
2. L. Rosenfeld:Theory of Electrons (North-Holland, Amsterdam, 1951).
3. G. Russakoff:Am. J. Phys.,38, 1188 (1970).
4. J. Van Vleck:The Theory of Electric and Magnetic Susceptibilities, 4th edition (Oxford University Press, London, 1952).
5. J. Voisin:Physica,52, 195 (1959).