Krasnov, K. A.; Slesareva, V. I.; Studentsov, E. P.; Slesarev, V. I. Journal of Organic Chemistry USSR (English Translation), 1987 , vol. 23, # 9 p. 1765 - 1769 Zhurnal Organicheskoi Khimii, 1987 , vol. 23, # 9 p. 1995 - 2000