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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, p. 26, July, 1976.
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Zhunev, P.A. Expediency criterion for reduction of the assortment of pipe fittings with the aim of increasing their output. Chem Petrol Eng 12, 627–629 (1976). https://doi.org/10.1007/BF01260485
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DOI: https://doi.org/10.1007/BF01260485