Petrova, R. G.; Churkina, T. D.; Kandor, I. I.; Dostovalova, V. I.; Freidlina, R. Kh. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, # 11 p. 2331 - 2336 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 11 p. 2519 - 2524