References
- Pollmann , P. and Stegemeyer , H. 1973 . Chem. Phys. Letters , 20 : 87
- de Gennes , P. G. 1972 . Solid State Commun. , 10 : 753 Mol. Cryst., Liquid Cryst., 21, 49 (1973)
- Pindak , R. S. , Huang , C. C. and Ho , J. T. 1974 . Solid State Commun. , 14 : 821
- Keyes , P. H. , Weston , H. T. and Daniels , W. B. 1973 . Phys. Rev. Letters , 31 : 628 R. Shashidhar and S. Chandrasekhar, J. de Physique, 36, C1–49 (1975)