Bezuglyi, P. A.; Treskach, V. I.; Ukrainets, I. V.; Grinenko, V. V.; Bevz, N. Yu. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 7.1 p. 1233 - 1236 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 7 p. 1410 - 1413