Konstantinova, T. G.; Moiseenkov, A. M.; Gul'tyai, V. P. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 9 p. 1897 - 1900 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 9 p. 2101 - 2104