1. V. M. Kuz’kin, Akust. Zh. 45, 258 (1999) [Acoust. Phys. 45, 224 (1999)].
2. V. M. Kuz’kin, A. V. Ogurtsov, and V. G. Petnikov, Akust. Zh. 44, 94 (1998) [Acoust. Phys. 44, 77 (1998)].
3. V. M. Kuz’kin and C. A. Pereselkov, Phys. Wave Phenomena 14, 52 (2006).
4. V. M. Kuz’kin and S. A. Pereselkov, Akust. Zh. 53, 557 (2007) [Acoust. Phys. 53, 487 (2007)].
5. V. I. Tikhonov, Statistical Radio Engineering (Radio i Svyaz’, Moscow, 1982) [in Russian].