Spaeth; Brunner
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Troeger; Beck
Archiv der Pharmazie (Weinheim, Germany), 1913 , vol. 251, p. 281
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Troeger; Boenicke
Archiv der Pharmazie (Weinheim, Germany), 1920 , vol. 258, p. 254

Beckurts; Frerichs
Chem. Zentralbl., 1903 , vol. 74, # II p. 1011
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Koerner, Boehringer
Gazzetta Chimica Italiana, 1883 , vol. 13, p. 365
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Beckurts; Frerichs
Archiv der Pharmazie (Weinheim, Germany), 1905 , vol. 243, p. 470
Chem. Zentralbl., 1903 , vol. 74, # II p. 1010