Krasnov, K. A.; Slesareva, V. I.; Selimanova, I. N.; Slesarev, V. I. Russian Journal of Organic Chemistry, 1993 , vol. 29, # 1.2 p. 180 Zhurnal Organicheskoi Khimii, 1993 , vol. 29, # 1 p. 211 - 212