1. L. Verbit and R. L. Tuggey, Mol. Cryst. & Liq. Cryst., 17, 49 (1971);
2. L. Verbit and G. A. Lorenzo, 4th International Liquid Crystal Conference, Kent State University, August 1972, Mol. Cryst. & Liq. Cryst., in press.
3. J. van der Veen, W. H. de Jeu, A. H. Grobben, and J. Boven, Mol. Cryst. & Liq. Cryst., 17, 291 (1972);
4. W. R. Young, I. Haller, and A. Aviram, Mol. Cryst. & Liq. Cryst., 12, 311 (1972).
5. G. W. Gray, “Molecular Structure and the Properties of Liquid Crystals,” Academic Press, New York, N. Y., 1962, chapter 9.