The claim is from Norman Polmar's "Hunters and Killers, vol 2: Anti-Submarine Warfare since 1943", page 148, who cites the following Soviet literature in the chapter dealing with wake detection:
Rear Adm. Ye. Buzov, Soviet Navy, "From the History of the Creation of Non-acoustic Means of Detecting Submarines", Morskoy sbornik, no. 7 (2003), 59.
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