Bredikhin, O. R.; Sharapov, O. R.; Ustyugov, A. N.; Al'fonsov, V. A. Russian Journal of General Chemistry, 1996 , vol. 66, # 12 p. 2001 - 2002 Zhurnal Obshchei Khimii, 1996 , vol. 66, # 12 p. 2057