Artamkina, G. A.; Grinfel'd, A. A.; Beletskaya, I. P. Journal of Organic Chemistry USSR (English Translation), 1980 , vol. 16, # 4 p. 612 - 615 Zhurnal Organicheskoi Khimii, 1980 , vol. 16, # 4 p. 698 - 702