Kirilyuk, I. A.; Grigor'ev, I. A.; Volodarskii, L. B. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 9.2 p. 1871 - 1879 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 9 p. 2113 - 2121