Faleev, N. G.; Ruvinov, S. B.; Saporovskaya, M. B.; Belikov, V. M.; Zakomyrdina, L. N.; et al. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 10 p. 2154 - 2156 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 10 p. 2341 - 2343