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Kolthoff, I. M. Chemisch Weekblad, 1920 , vol. 17, p. 82 - 85 Full Text Show Details Kolthoff, I. M. Pharmaceutisch Weekblad, 1919 , vol. 56, p. 426 - 438 Full Text Show Details Kolthoff, I. M. Zeitschrift fuer Analytische Chemie, 1921 , vol. 60, p. 338 - 353