1. and , Westinghouse Research Laboratories Scientific Paper 029-G000-P13, Dec. 8, 1961.
2. and , Westinghouse Research Laboratories Scientific Paper 62-129-103-P8, May 10, 1962.
3. See for example, and , in Solid State Physics, edited by and , Academic Press, New York 1961, Vol. 12 (p. 275).
4. The Anharmonic Solid, Vol. II, Chap. 5, Lecture notes, Physics Department, Carnegie Institute of Technology, 1962 (unpublished).
5. An Introduction to Applied Anisotropic Elasticity, Oxford University Press, Oxford 1961.