Ladenburg
Justus Liebigs Annalen der Chemie, 1888 , vol. 247, p. 58
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Lipp
Justus Liebigs Annalen der Chemie, 1896 , vol. 289, p. 229
Chemische Berichte, 1898 , vol. 31, p. 591
Profft; Schneider
Archiv der Pharmazie (Weinheim, Germany), 1956 , vol. 289, p. 99,102
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Pines; Wunderlich
Journal of the American Chemical Society, 1959 , vol. 81, p. 2568,2569