1. J. Solyom, Adv. in Physics
28, 201 (1979).
2. B. Horovitz, H. Gutfreund and M. Weger, Phys. Rev. B
8, 3174 (1975).
3. R. E. Peierls, Ann. Phys. 4, 121 (1930) and Quantum Theory of Solids, Oxford University Press (1955), p. 108.
4. R. Comes and G. Shirane in Highly Conducting One-Dimensional Solids, ed. J. T. Devreese, R. P. Evrard and V. E. Van Doren, Plenum Press, London (1979), p. 17.
5. For a review, J. A. Wilson, F. J. Di Salvo and S. Mahajan, Adv. in Physics 24, 117 (1975). See also Physics and Chemistry of Materials with Layered Compounds, D. Reidel Publishing Company, Dordrecht, Holland, Vols. 1 to 6.