1. L. M. Lyamshev, Sound Reflection by Thin Plates and Covers in a Liquid (Akad. Nauk SSSR, Moscow, 1955).
2. V. N. Krasil’nikov, Prikl. Mat. Mekh. 25, 764 (1961).
3. D. P. Kouzov, Prikl. Mat. Mekh. 27, 1037 (1963).
4. D. P. Kouzov, Prikl. Mat. Mekh. 33, 240 (1969).
5. B. P. Belinskii, Prikl. Mat. Mekh. 42, 486 (1978).