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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 46–48, May, 1980.
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Podobaeva, T.P., Gonsales, M.G., Polyakova, A.A. et al. Determination of metal porphyrins in asphaltenes. Chem Technol Fuels Oils 16, 351–353 (1980). https://doi.org/10.1007/BF00726633
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DOI: https://doi.org/10.1007/BF00726633