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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 3, pp. 1–4, March, 1969.
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Root, E.I., Karpyshev, E.S. & Molokov, L.A. Engineering progress in surveying. Hydrotechnical Construction 3, 203–205 (1969). https://doi.org/10.1007/BF02377206
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DOI: https://doi.org/10.1007/BF02377206