1. S. Chandrasekhar: “Liquid Crystals”, Cambridge Univ. Press (1977)
2. P. G. de Gennes: “The Physics of Liquid Crystals”, Clarendon Press, Oxford (1971)
3. “Liquid Crystalline Order in Polymers”, Ed. by A. Blumstein: Academic Press, New York (1978)
4. “Polymer Liquid Crystals”, A. Ciferri, W. R. Krigbaum and R. B. Meyers, Eds.: Academic Press, New York (1982)
5. W. Maier and A. Saupe: Z. Naturforschg. 14a, 882 (1959); ibid., 15a, 287 (1960)