Kondratov, S.A.; Shteinberg, L.Ya.; Shein, S.M.; Udovichenko, L.V.; Boiko, V.D. Russian Journal of Organic Chemistry, 1994 , vol. 30, # 2 p. 298 - 300 Zhurnal Organicheskoi Khimii, 1994 , vol. 30, # 2 p. 284 - 285