[1] V. G. Kirtskhalia, Open Journal of Acoustics, Vol. 2. 2012, pp. 80-85.
[2] V. G. Kirtskhalia, Open Journal of Acoustic, Vol. 2, 2012, pp. 115-120.
[3] L. D. Landau and E. N. Lifchitz, “Nauka,” Theoretical Physics, Moscow, 1988.
[4] A. D. Pierse, “The Wave Theory of Sound,” Acoustical Society of America, New York, 1989.
[5] E. E. Gossard and W. H. Hooke, “Waves in the Atmosphere,” Elsevier, New York, 1975.
[6] V. G. Kirtskhalia and A. A. Rukhadze, Georgian International Journal of Science and Technology, Vol. 1, 2008, pp. 239-248.