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Translated from Khimicheskoeie i Neftyanoe Mashinostroenie, No. 1, pp. 4–5, January, 1977.
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Kalitin, P.P., Makarov, N.A. A badge of quality for each product. Chem Petrol Eng 13, 7–9 (1977). https://doi.org/10.1007/BF01152900
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DOI: https://doi.org/10.1007/BF01152900