Abramova, N. M.; Zotova, S. V.; Nesmeyanova, O. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1982 , vol. 31, # 5 p. 961 - 964 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1982 , # 5 p. 1080 - 1083