1. J. Cognard, Mol. Cryst. Liq. Cryst. 51, 1 (1982).MCLCA50026-8941
2. D. W. Berreman, Phys. Rev. Lett. 28, 1683 (1972).PRLTAO0031-9007
3. D. W. Berreman, Mol. Cryst. Liq. Cryst. 23, 215 (1973).MCLCE91058-725X
4. U. Wolff, W. Grenbel, and H. Kruger, Mol. Cryst. Liq. Cryst. 23, 187 (1973).MCLCA50026-8941
5. L. T. Creagh and A. R. Kmetz, Mol. Cryst. Liq. Cryst. 24, 59 (1973).MCLCA50026-8941