1. V. V. Lemanov and O. V. Shakin, Fiz. Tverd. Tela (Leningrad),14, 229 (1972).
2. V. I. Balakshii, V. B. Voloshinov, and V. I. Parygin, Radiotekh, Elektron.,11, 228 (1971).
3. S. M. Shandarov, in: Acoustooptic Signal Processing Devices [in Russian], LETI (1977).
4. N. K. Kikoin (editor), Tables of Physical Magnitudes (Handbook) [in Russian], Izd. Atomizdat (1976).
5. S. M. Shandarov and A. Ya. Deminov, Proc. Eighth All-Union Conf. on Quantum Acoustics and Acoustoelectronics [in Russian] Kazan' (1974);