Rozhkov, I. N.; Igumnov, S. M.; Pletnev, S. I.; Chaplina, I. V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 4.2 p. 856
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 4 p. 951