1. Several review articles, emphasizing electro-optic properties of liquid crystals are available: R. A. Soref, “Liquid Crystal Light Control Experiments,” in The Physics of Opto-Electronic Materials, ed. W. A. Albers, Jr., Plenum Press, New York (1971); A. Sussman, “Electro-Optic Liquid Crystal Devices: Principles and Applications,” IEEE Trans. Parts, Hybrids, and Packaging, Vol. PHP8, p. 24 (1972); and A. Sussman, “Liquid Crystals in Display Systems,” in Liquid Crystalline Systems, ed. G. W. Gray and P. A. Winsor, Ellis Horwood, London (in press).
2. For example in 1969, there were 70 papers listed in Physics Abstracts. In 1970, 250; in 1971, 315; and in 1972, 390.
3. P. DeGennes, “Electrohydrodynamic Effects in Nematic Liquid Crystals I. DC Effects,” in Comments on Solid State Physics, Vol. 3, p. 35 (1970).
4. P. A. Penz, Electrohydrodynamic Solutions for Nematic Liquid Crystals with Positive Dielectric Anisotropy,” Mol. Cryst., Vol. 23, p. 1 (1973).
5. W. H. DeJeu, C. J. Gerritsma, and Th. W. Lathouwers, “Instabilities in Electric Fields of Nematic Liquid Crystals with Positive Dielectric Anisotropy: Domains, Loop Domains, and Reorientation,” Chem. Phys. Lett., Vol. 14, p. 503 (1972).