1. L.D. Landau, E.M. Lifshitz: Electrodynamics of Continuous Media (Gostekhizdat, Moscow 1957) [English transl.: Pergamon, Oxford 1960]
2. M. Born: Optik (Springer, Berlin 1933);
3. M. Born, E. Wolf: Principles of Optics (Pergamon, Oxford 1964)
4. S. Szivessy: “Kristalloptik”, in Handbuch der Physik, Vol.20 (J. Springer, Berlin 1928) p.635
5. G.N. Ramachandran, S. Ramaseshan: “Crystal Optics,” in Encyclopedia of Physicsj Vol.25/1 (Springer, Berlin, Göttingen, Heidelberg 1961)