REFERENCES
1.
M. Born and E. Wolf, Principles of Optics (MacMillan, New York, 1964), 2nd ed., Chap. XII.
2.
R. Krishnan, Progress in Crystal Physics (Madras, Central Art Press, 1958).
3.
4.
5.
E. G. Spencer and P. V. Lenzo, IEEE Ultrasonics Symposium, Boston, December 1965.
E. G. Spencer, IEEE Journal of Quantum Electronics, to be published.
6.
J. F. Nye, Physical Properties of Crystals (Clarendon Press, Oxford, 1960), p. 250.
7.
8.
9.
E. I. Gordon, to be published.
10.
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© 1966 The American Institute of Physics.
1966
The American Institute of Physics
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