1. G. Meier, E. Sackman, J.G. Grabmeier, Application of Liquid Crystals, Springer, Berlin, 1975.
2. R. Williams, in: G.W. Gray, P.A. Winsor (Eds.), Liquid Crystals and Plastic Crystals, Vol. 2, Wiley, New York, 1974.
3. Forces causing the orientation of an anisotropic liquid
4. G.R. Luckhurst, in: G.W. Gray, P.A. Winsor (Eds.), Liqiud Crystals and Plastic Crystals, Vol. 2, Wiley, New York, 1974.
5. R.C. Moore, M.M. Denn, in: A.E. Zachariades, R.S. Porter (Eds.), High Modulus Polymers, Marcel Dekker, New York, 1988, Chapter 7.