Kikina
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1900 , vol. 32, p. 175
Chem. Zentralbl., 1900 , vol. 71, # II p. 117
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Werner
Justus Liebigs Annalen der Chemie, 1902 , vol. 321, p. 336
Chemische Berichte, 1904 , vol. 37, p. 3086