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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, p. 53, December, 1970.
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Popov, A. Letter to the editors. Hydrotechnical Construction 4, 1168 (1970). https://doi.org/10.1007/BF02397603
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DOI: https://doi.org/10.1007/BF02397603