1. S. S. Vinogradov, “A soft spherical ‘cap’ in the field of a plane acoustic wave,”Zh. Vychisl. Mat. Mat. Fiz.,18, 1302–1324 (1978).
2. V. V. Dykhta,Nonstationary Scattering of Acoustic Waves by Nonclosed Shells [in Russian], Naukova Dumka, Kiev (1982).
3. U. K. Nigul, Ya. A. Metsaveer, N. D. Veksler, and M. E. Kutser,Echo-Signals from Elastic Objects [in Russian], Vol. 2, Institute of Cybernetics of the Estonian SSR, Tallinn (1974).
4. Ya. S. Podstrigach and A. P. Poddubnyak,Scattering of Acoustic Beams on Elastic Bodies of Spherical and Cylindrical Shape [in Russian], Naukova Dumka, Kiev (1986).
5. Ya. S. Podstrigach, A. P. Poddubnyak, and D. V. Grilitskii, “Diffraction of a sharply focused sound pulse on an acoustically soft sphere,”Dokl. Akad. Nauk Ukr. RSR, Ser. A, No. 3, 240–243 (1978).