Arbuzov, B. A.; Erastov, O. A.; Romanova, I. P.; Zyablikova, T. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 12 p. 2336 - 2338 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , # 12 p. 2803 - 2806