Knunyants, I. L.; Gontar', A. F.; Vinogradov, A. S.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 3 p. 633 - 635
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 3 p. 694 - 697