Literature cited
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Translated from Izmeritel'naya Tekhnika, No. 3, pp. 60–62, March, 1971.
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Markelov, V.A. Interference protection device for acoustic echo-location instruments. Meas Tech 14, 450–453 (1971). https://doi.org/10.1007/BF00980289
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DOI: https://doi.org/10.1007/BF00980289