Trofimov, B. A.; Mikhaleva, A. I.; Petrova, O. V.; Sigalov, M. B. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 10 p. 1889 - 1894 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 10 p. 2095 - 2101