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Coufalik, F., Whitaker, J.W., Crossley, H.E. et al. Kohlenuntersuchung. Fresenius, Zeitschrift f. anal. Chemie 94, 381–382 (1933). https://doi.org/10.1007/BF01352258
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DOI: https://doi.org/10.1007/BF01352258