1. A. F. Sobolev, Akust. Zh. 53, 861 (2007) [Acoust. Phys. 53, 762 (2007)].
2. A. F. Sobolev, in Proc. of the 5th Sci. Conf. on Hydroaviation, Gidroaviasalon-2004 (TsAGI, Moscow, 2004), pp. 184–195.
3. Recovery No. 7 to International Standards and Recommended Practice. Environmental Protection. Appendix 16 to Convence on Intern. Civian Aviation. Vol. 1, Aviational Noise. (IKAO, 2001).
4. A. F. Sobolev, Akust. Zh. 46, 536 (2000) [Acoust. Phys. 46, 466 (2000)].
5. A. F. Sobolev, N. M. Solov’eva, and R. D. Filippova, Akust. Zh. 41, 146 (1995) [Acoust. Phys. 41, 124 (1995)].