1. F. D. Tappert, in Propagation of the Waves and Underwater Acoustics, Ed. by R. Keller and A. Papadakis (Springer, Heidelberg, 1977; Mir, Moscow, 1980), pp. 180–226.
2. S. M. Rytov, Yu. A. Kravtsov, and V. I. Tatarskii, Introduction to Statistical Radio Physics (Nauka, Moscow, 1978).
3. L. M. Brekhovskikh and O. A. Godin, Acoustics of Layered Medium, Vol. 2: Point Sources and Bounded Beams (Nauka, Moscow, 1989; Springer, Berlin, 1999).
4. L. Nghiem-Phu and F. D. Tappert, J. Acoust. Soc. Am. 78(1), 164 (1985).
5. F. B. Jensen, W. A. Kuperman, M. B. Porter, and H. Schmidt, in Computational Ocean Acoustics (AIP, New York, 1993), Chap. 6.