Yakubov, A. P.; Tsyganov, D. V.; Belen'kii, L. I.; Krayushkin, M. M.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 7.2 p. 1427 - 1432
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 7 p. 1609 - 1615

Yakubov, A. P.; Tsyganov, D. V.; Belen'kii, L. I.; Krayushkin, M. M.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 7.2 p. 1427 - 1432
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 7 p. 1609 - 1615

Popovich et al.
Pr. W. Virginia Acad., 1957 , vol. 29/30, p. 51