Rakitin, O. A.; Vlasova, O. G.; Chertanova, L. F.; Khmel'nitskii, L. I.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 7.2 p. 1474 - 1478
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 7 p. 1625 - 1629