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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 40–43, September, 1968.
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Vainshtein, N.Y. Hydraulic engineering tunneling rates. Hydrotechnical Construction 2, 816–820 (1968). https://doi.org/10.1007/BF02376570
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DOI: https://doi.org/10.1007/BF02376570