Varlamov, V. T.; Denisov, E. T.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 4.1 p. 657 - 662
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 4 p. 743 - 749