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3. P. M. Morse, Vibration and Sound (McGraw-Hill, New York, 1948; GITTL, Moscow, 1949).
4. J. J. Faran, J. Acoust. Soc. Am. 23, 405 (1951).
5. K. J. Diercks and R. Hickling, J. Acoust. Soc. Am. 41, 380 (1967).