Vasil'ev, A. A.; Tatarinova, V. I.; Petrosyan, V. A.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 6.2 p. 1221 - 1224
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 6 p. 1381 - 1384

Fischer,E.; Bergmann
Justus Liebigs Annalen der Chemie, 1913 , vol. 398, p. 122

Wenus-Danilowa
Zhurnal Obshchei Khimii, 1938 , vol. 8, p. 477,480
Chem. Zentralbl., 1940 , vol. 111, # I p. 697