Nizova, G. V.; Shul'pin, G. B.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1987 , vol. 36, # 9 p. 1920 - 1921
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1987 , # 9 p. 2070 - 2071