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Rybak, B.M., Makuschinskaja, N.S., Tschernow, G.I. et al. Erdöl. Fresenius, Zeitschrift f. anal. Chemie 103, 237 (1935). https://doi.org/10.1007/BF01376416
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DOI: https://doi.org/10.1007/BF01376416