1. See for example, papers devoted to this subject in the Proceedings of the. International Conference on Physics and Chemistry of Low Dimensional Synthetic Metals, Abano Terme (Italy) (1984), Mol. Cryst. Liq. Cryst. 117, 1–486 (1985)
2. L.S. Lichtmann, Ph.D Thesis, Cornell University, 1981, unpublished
3. H. Kuzmany, Phys. St. Sol. (b) 97, 521 (1980)
4. H. Kuzmany, E.A. Imhoff, D.B. Fitchen and A. Sarhangi, Phys. Rev. B 26, 7109 (1982)
5. G.P. Brivio and E. Mulazzi, Phys. Rev. B 30, 676 (1984)