Rusinov, V. L.; Tumashov, A. A.; Pilicheva, T. L.; Chupakhin, O. N. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 5.2 p. 952 - 957 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 5 p. 1100 - 1105