1. Maxwell JC (1865) Phil Trans 155:459
2. Maxwell JC (1868) Phil Trans 158:643
3. Landau LD, Lifschitz EM (1977) Textbook of theoretical physics, vol. II. Classical field theory. Akademie-Verlag, Berlin
4. Böttcher CJF (1973) Theory of electric polarization, vol. I. Dielectrics in static fields. Elsevier Amsterdam, Oxford, New York
5. de Gennes PG (1974) The physics of liquid crystals. Clarendon Press, Oxford