Karasik, A. A.; Erastov, O. A.; Arbuzov, B. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 6.2 p. 1256 - 1260 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 6 p. 1375 - 1379