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Folin, O., Boseworths, A.W. Zur Bestimmung von Ammoniak in Düngemitteln. Fresenius, Zeitschrift f. anal. Chemie 55, 414–415 (1916). https://doi.org/10.1007/BF01766724
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DOI: https://doi.org/10.1007/BF01766724