1. in Polymers, Liquid Crystals and Low Dimensional Solids and Eds. (Plenum, New York, 1984), p. 335.
2. See, for example, Quantum Theory of the Solid State, Part A (Academic, New York, 1974), p. 136.
3. Quantum Theory of Solids (Wiley, New York, 1963).
4. See, for instance, and Theoretical Solid-state Physics (Dover, New York, 1985).