Khandin, A. V.; Vartanyan, M. M.; Brezhnev, L. Yu.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 10 p. 2200
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 10 p. 2389