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On an extremal problem from technical acoustics. (English. Russian original) Zbl 1041.76554

Vestn. St. Petersbg. Univ., Math. 32, No. 4, 28-32 (1999); translation from Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. 1999, No. 4, 34-38 (1999).

MSC:

76Q05 Hydro- and aero-acoustics
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