Rodionov, V. I.; Shakirov, M. M.; Isaev, I. S.; Koptyug, V. A. Journal of Organic Chemistry USSR (English Translation), 1980 , vol. 16, # 7 p. 1303 - 1310 Zhurnal Organicheskoi Khimii, 1980 , vol. 16, # 7 p. 1515 - 1523