Lebedew
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1911 , vol. 43, p. 1737
Chem. Zentralbl., 1912 , vol. 83, # I p. 1695

Lebedew
Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1913 , vol. 45, p. 1378
Chem. Zentralbl., 1914 , vol. 85, # I p. 1411