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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 1, p. 59, January, 1970.
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Lavrent'ev, V.F. New qualifications for supervisory workers and specialists in the oil refining and petrochemical industry. Chem Technol Fuels Oils 6, 70–71 (1970). https://doi.org/10.1007/BF00729746
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DOI: https://doi.org/10.1007/BF00729746