Afonin, A. V.; Vashchenko, A. V.; Danovich, D. K.; Trzhtsinskaya, B. V.; Baikalova, L. V.; Apakina, E. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 7.2 p. 1538 - 1541 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , vol. 38, # 7 p. 1676 - 1679