1. G N Ramachandran and S Ramaseshan,Crystal optics in Handbuch der Physik, Edited by S Flugge (Springer Verlag, Berlin, 1961)
2. M Born and E Wolf,Principles of optics, Third edition, (Pergamon Press, Oxford 1965)
3. C Huygens,Traite’ de La Lumiere (Completed in 1968 and published in Leydon in 1690, see [2])
4. G G Stokes,Trans. Cam. Philos. Soc. 9, 399 (1852)
5. H Poincare,Theorie Mathematique de Lumiere (Georges Carre, Paris, 1892)