1. N. P. Badalyan, V. A. Burov, S. A. Morozov, and O. D. Rumyantseva, Akust. Zh. 54, 990 (2008) [Acoust. Phys. 54, 862 (2008)].
2. V. V. Krylov, The Base of Emission Theory and Sound Scattering (Mosk. Gos. Univ., Moscow, 1989) [in Russian].
3. M. A. Isakovich, General Acoustics (Nauka, Glavn. Redaktsiya Fiz.-Mat. Lit., Moscow, 1973) [in Russian].
4. F. A. Berezin and L. D. Faddeev, Dokl. Akad. Nauk SSSR 137(5), 1011 (1961).
5. V. A. Burov and S. A. Morozov, Akust. Zh. 47(6), 751 (2001) [Acoust. Phys. 47, 659 (2001)].