Knunyants, I. L.; Bargamova, M. D.; Pletnev, S. I.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 8 p. 1336 - 1341
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 8 p. 1861 - 1865