Yurtanov, A. I.; Martynov, I. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. <1> 38, # 12 p. 2497 - 2500 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 12 p. 2729 - 2732