1. and , in: Handbook of Elastic Properties of Solids, Liquids, and Gases, Vol. II (Academic, San Diego, 2001), p. 97.
2. Bonding and Structure of Molecules and Solids (Oxford University Press, Oxford, 1995).
3. On anomalous vibrational spectra
4. Handbuch der Physik, Vol. VII-1 (Springer, Berlin, 1955), pp. 325, 373ff.
5. Ref. [1], p. 57.