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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 2, p. 61, February, 1970.
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Zheleznyakov, G.V. Reader's letter. Hydrotechnical Construction 4, 186 (1970). https://doi.org/10.1007/BF02377243
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DOI: https://doi.org/10.1007/BF02377243