1. Bekefi, G. (1966): Radiation Processes in Plasmas (Wiley, New York)
2. Jackson, J.D. (1962): Classical Electrodynamics (Wiley, New York)
3. Landau, L.D., Lifschitz, E.M. (1967): Lehrbuch der Theoretischen Physik, Vol. 2 (Akademie, Berlin)
4. Lang, K. (1974): Astrophysical Formulae (Springer, New York, Heidelberg, Berlin) Chap. 1
5. Longair, M.S. (1981): High Energy Astrophysics (Cambridge University Press, Cambridge) Chap. 3, 18