1. Dubois, J.C., Couttet, A., Zann, A. (Thomson): DE-OS 2.309.501; FR 7.206.889; FR 7.301.083 (1973)
2. Reiffenrath, V., Finkenzeller, U., Poetsch, E., Rieger, B., Coates, D.: Proc. SPIE-Int. Soc. Opt. Eng. 1257, 84 (1990)
3. Saitoh, G., Satoh, M., Hasegawa, E.: Mol. Cryst. Liq. Cryst. A301, 13–18; Chem. Abstr. 128, 41813 (1997)
4. Pavluchenko, A.I., Smirnova, N.I., Petrov, V.F., Fialkov, Yu.A., Shelyazhenko, S.V., Yagupol'skii, L.M.: Mol. Cryst. Liq. Cryst. 209, 225–235; Chem. Abstr. 116, 96398 (1991)
5. Pavluchenko, A.I., Fialkov, Yu.A., Shelyazhenko, S.V., Yagupol'skii, I.I., Smirnova, N.I., Petrov, V.F., Grebenkin, M.F.: Zh. Fiz. Khim. 65, 2249–2252; Russ. J. Phys. Chem. 65, 1190–1191 (1991)