1. G. D. Malyuzhinets, Trudy Akust. Inst., No. 15, 124 (1971).
2. G. D. Malyuzhinets, Trudy Akust. Inst., No. 15, 140 (1971).
3. M. P. Zavadskaya, A. V. Popov, and B. L. Egel’skii, Akust. Zh. 21, 732 (1975).
4. Yu. I. Bobrovnitskii, Akust. Zh. 49, 731 (2003) [Acoust. Phys. 49, 620 (2003)].
5. Yu. I. Bobrovnitskii, Akust. Zh. 50, 751 (2004) [Acoust. Phys. 50, 647 (2004)].