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Helfer
Helvetica Chimica Acta, 1924 , vol. 7, p. 955
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Kohn; Guttmann
Monatshefte fuer Chemie, 1924 , vol. 45, p. 582
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Robinson; Smith
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Mauthner
Journal fuer Praktische Chemie (Leipzig), 1937 , vol. <2> 149, p. 324,325
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Chunter <Hunter>; Ratman
Zhurnal Obshchei Khimii, 1937 , vol. 7, p. 2202,2203, 2204
Chem. Zentralbl., 1938 , vol. 109, # I p. 3331
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Ullmann
Justus Liebigs Annalen der Chemie, 1903 , vol. 327, p. 110