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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 10, pp. 45–50, October, 1979.
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Safronov, A.I. Anniversary exposition of the People's Republic of Bulgaria. Hydrotechnical Construction 13, 1024–1032 (1979). https://doi.org/10.1007/BF02304945
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DOI: https://doi.org/10.1007/BF02304945