Krasnaya, Zh. A.; Smirnova, Yu. V.; Tatikolov, A. S.; Bogdanov, V. S.; Nikishova, E. V.; Savel'ev, V. L. Russian Chemical Bulletin, 1995 , vol. 44, # 3 p. 520 - 526 Izvestiya Akademi Nauk, Seriya Khimicheskaya, 1995 , # 3 p. 537 - 543