1. T. R. Koehler, Lattice dynamics of quantum crystals, in Dynamical Properties of Solids, Vol. 2, pp. 1–104, edited by G. K. Horton and A. A. Maradudin. North-Holland Publ. Co. Amsterdam (1975).
2. H. R. Glyde, Solid Helium, in Rare Gas Solids, edited by M. L. Klein and J. A. Venables, Chapter 7. Academic Press Inc. Ltd., London (1976).
3. A. A. Maradudin, E. W. Montroll, G. Weiss, and I. P. Ipatova, Theory of lattice dynamics in the harmonic approximation, Academic Press Inc., New York (1971).
4. T. H. K. Barron and M. L. Klein, Perturbation theory of anharmoniccrystals, in Dynamical Properties of Solids, I, 391–449. North-Holland Publ. Co. Amsterdam (1975).
5. N. R. Werthamer, Self-consistent phonon theory of rare gas solids, in Rare Gas Solids, ed. by M. L. Klein and J. A. Venables, Ch. 5. Academic Press Inc. (London) Ltd. (1976).