1. K. Yamanouchi, T. Meguro, and Z. H. Chen, Proc. IEEE Ultrasonics Symp., 173 (1987).
2. I. I. Klyukin, Akust. Zh. 6, 213 (1960) [Sov. Phys. Acoust. 6, 209 (1960)].
3. I. I. Klyukin and Yu. D. Sergeev, Akust. Zh. 10, 60 (1964) [Sov. Phys. Acoust. 10, 49 (1964)].
4. V. V. Tyutekin and A. P. Shkvarnikov, Akust. Zh. 18, 441 (1972) [Sov. Phys. Acoust. 18, 369 (1972)].
5. V. P. Plesskii and A. V. Simonyan, Akust. Zh. 37, 162 (1991) [Sov. Phys. Acoust. 37, 81 (1991)].