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Clover
American Chemical Journal, 1908 , vol. 39, p. 630,644
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Wallach
Justus Liebigs Annalen der Chemie, 1885 , vol. 227, p. 286 Anm.
Justus Liebigs Annalen der Chemie, 1888 , vol. 245, p. 196
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Clover
Chem. Zentralbl., 1907 , vol. 78, # I p. 1795