Umnowa
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1910 , vol. 42, p. 1533
Chem. Zentralbl., 1911 , vol. 82, # I p. 1279
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Gorski
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1910 , vol. 42, p. 1356
Chem. Zentralbl., 1911 , vol. 82, # I p. 635