1. H. Oberst, in Technical Aspects of Sound, Ed. by E. G. Richardson (Elsevier, 1957; Voenizdat, Moscow, 1962), p. 262.
2. E. Meyer, Appl. Acoust. 3, 169 (1970).
3. V. P. Glotov, Sov. Phys. Acoust. 4 (3), 239 (1958).
4. M. A. Isakovich, General Acoustics. Student’s Book (Nauka, Moscow, 1973) [in Russian].
5. Ch. Devin, J. Acoust. Soc. Am. 31 (12), 1654 (1959).