Feofilaktow
Doklady Akademii Nauk SSSR, 1939 , vol. 24, p. 756
Zhurnal Obshchei Khimii, 1940 , vol. 10, p. 253
Chem.Abstr., 1940 , p. 1971
Chem. Zentralbl., 1940 , vol. 111, # II p. 1971