Andreev, N. A.; Levashova, V. I.; Bunina-Krivorukova, L. I. Journal of Organic Chemistry USSR (English Translation), 1985 , vol. 21, # 5 p. 966 - 970 Zhurnal Organicheskoi Khimii, 1985 , vol. 21, # 5 p. 1061 - 1065