Skakovskii, E. D.; Ogorodnikova, M. M.; Tychinskaya, L. Yu.; Rykov, S. V. Journal of Organic Chemistry USSR (English Translation), 1992 , vol. 28, # 7.1 p. 1109 - 1114 Zhurnal Organicheskoi Khimii, 1992 , vol. 28, # 7 p. 1407 - 1413