1. Ultrasound. Small Encyclopedia, Ed. by I. P. Golyamina (Sovetskaya Éntsiklopediya, Moscow, 1979).
2. Yu. V. Gulyaev, Pis’ma Zh. Éksp. Teor. Fiz. 9(2), 68 (1969) [JETP Lett. 9, 120 (1969)].
3. I. V. Anisimkin, in Proceedings of 2003 IEEE Ultrasonics Symposium (Honolulu, USA, 2003).
4. E. L. Adler, J. K. Slaboszewics, G. W. Farnell, and C. K. Jen, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 37, 215 (1990).
5. A. J. Slobodnik, Jr., E. D. Conway, and R. T. Delmonico, Microwave Acoustic Handbook (1973), AFCRL-TR-730597.