Odinokov, V. N.; Ishmuratov, G. Yu.; Galeeva, R. I.; Kharisov, R. Ya.; Sokol'skaya, O. V.; at al. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 4 p. 646 - 651 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 4 p. 719 - 724