1. See, for example, (a) Chapter X as well as (b) A. Hudson and G.R. Luckhurst, Chem. Rev., 69, 191 (1969).
2. R. Wilson and D. Kivelson, J. Chem. Phys., 44, 154 (1966).
3. G.R. Luckhurst and J.N. Ockwell, Mol. Phys., 16, 165 (1969).
4. G.W. Gray, Molecular Structure and the Properties of Liquid Crystals (Academic Press, London, New York, 1962).
5. A. Saupe, Angew.Chemie (Internat. Edit.) 7, 97 (1968).