Naddaka, V. I.; Avanesyan, K. V.; Cherkinskaya, M. L.; Minkin, V. I. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 12 p. 2245 - 2250 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 12 p. 2489 - 2494