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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 2, pp. 39–42, February, 1987.
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Pik, L.I. Scientific and technical progress in engineering-geodetic surveys. Hydrotechnical Construction 21, 96–100 (1987). https://doi.org/10.1007/BF01424912
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DOI: https://doi.org/10.1007/BF01424912