v. Pechmann; Neger
Justus Liebigs Annalen der Chemie, 1893 , vol. 273, p. 202
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v. Pechmann
Chemische Berichte, 1891 , vol. 24, p. 3600
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Willstaetter; Pfannenstiel
Justus Liebigs Annalen der Chemie, 1920 , vol. 422, p. 7