Temnikowa
Zhurnal Obshchei Khimii, 1940 , vol. 10, p. 468,473
Chem. Zentralbl., 1940 , vol. 111, # II p. 1860
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v. Auwers; Ludewig; Mueller
Justus Liebigs Annalen der Chemie, 1936 , vol. 526, p. 143,170
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Faworskii