Trzhtsinskaya, B. V.; Apakina, E. V.; Afonin, A. V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 4.2 p. 834 - 836
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 4 p. 928 - 931