1. Uematsu, J., Uematsu, Y.: this issue, p. 37
2. De-Visser, A., De Groot, K. Banties, A.: J. Polymer Sci. 9, A-1, 1893 (1971)
3. Platé, N. A., Shibaev, V. P., Tal'roze, R. V.: in Uspekhi khimii i fiziki polimerov (Advances in chemistry and physics of polymers), Khimiya, Moscow 1973, p. 127
4. Strzelecki, L., Liebert, L.: Bull. Soc. chim. France, N 2, 605 (1973)
5. Blumstein, A., Blumstein, R., Murphy, G., J. Billard: in Liquid Crystals and Ordered Fluids (Ed.s. Johnson, J. F., Porter, R. S.), Plenum Press, New York 1974, vol. 2, p. 277