1. R. A. Saenger, J. Acoust. Soc. Am. 33, 1674 (1961).
2. V. I. Bardyshev, A. M. Velikanov, and N. G. Kozhelupova, Tr. Akust. Inst. 11, 156 (1970).
3. V. I. Bardyshev, N. G. Kozhelupova, and V. I. Kryshniĭ, in Proceedings of 7th All-Union Acoustical Conference, Leningrad, 1971.
4. V. I. Bardyshev, N. G. Kozhelupova, and V. I. Kryshniĭ, Akust. Zh. 19, 129 (1973) [Sov. Phys. Acoust. 19, 95 (1973)].
5. L. N. Zakharov and V. A. Kirshov, in Proceedings of VIII All-Union Acoustical Conference, Moscow, 1973, Section N, pp. 110–113.