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In the summer of 1958, when I attended a Soviet acoustics meeting in Moscow, I made the acquaintance of Konstantin Naugolnykh, a student at the Acoustics Institute in Moscow. Naugolnykh was characterized by his youth, his good English, and his overriding interest in nonlinear acoustics, which prompted him in conversation to bore straight through his listener in pursuit of an answer to any physical or mathematical problem in the field.
Robert T. Beyer (1960) studied this question.