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Ritter, G.J., Fleck, L.C., Benesch, E. et al. Zellstoff, Holz, Papier. Fresenius, Zeitschrift f. anal. Chemie 66, 473–480 (1925). https://doi.org/10.1007/BF01380445
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DOI: https://doi.org/10.1007/BF01380445