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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 46–48, September, 1974.
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Asaf'ev, L.V., Korotkin, I.M. Echo sounding through ice. Hydrotechnical Construction 8, 870–872 (1974). https://doi.org/10.1007/BF02380454
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DOI: https://doi.org/10.1007/BF02380454