Literature cited
V. V. Furduev, Acoustical Foundations of Broadcasting [in Russian] (State Press for Problems of Communications and Radio, Moscow, 1960).
L. L. Beranek, Acoustical Measurements [Russian translation] (IL, Moscow, 1952).
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Reznikov, A.E., Snytko, A.Y. Problem of measuring the axial concentration coefficient in ultrasonic radiators. Meas Tech 8, 654–657 (1965). https://doi.org/10.1007/BF00984074
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DOI: https://doi.org/10.1007/BF00984074