Konowalow
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1905 , vol. 37, p. 1120
Chem. Zentralbl., 1906 , vol. 77, # I p. 737
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Chonin
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1909 , vol. 41, p. 339
Chem. Zentralbl., 1909 , vol. 80, # II p. 587