F. Brochard, 1970, J. Phys. (Paris), 31, 691, 10.1051/jphys:01970003107069100
J. Rault, 1970, Phys. Lett. A, 32, 199, 10.1016/0375-9601(70)90274-4
C. F. Heyes, 1976, Mol. Cryst. Liq. Cryst., 36, 245, 10.1080/15421407608084328
L. Liébert, 1979, J. Phys. (Paris) Lett., 40, L, 10.1051/jphyslet:019790040015036300
S. H. Chen, 1983, Phys. Rev. Lett., 51, 2298, 10.1103/PhysRevLett.51.2298
A. M. Figueiredo Neto, 1985, J. Phys. (Paris) Lett., 46, L, 10.1051/jphyslet:019850046011049900
A. R. V. Bertrand, 1970, Rev. Inst. Fr. Pet., XXV, 16
L. Liébert, 1984, J. Phys. (Paris) Lett., 45, L, 10.1051/jphyslet:01984004504017300
A. M. Figueiredo Neto, 1981, Mol. Cryst. Liq. Cryst., 74, 109, 10.1080/00268948108073697