Bondarenko, N. A.; Rudomino, M. V.; Tsvetkov, E. N.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 9.2. p. 1989
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , vol. 39, # 9 p. 2180 - 2181