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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 6, pp. 33–34, June, 1973.
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Belkin, M.I., Balashov, Y.A. A system for objectively estimating petroleum equipment production. Chem Petrol Eng 9, 548–551 (1973). https://doi.org/10.1007/BF01161678
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DOI: https://doi.org/10.1007/BF01161678