Skvortsov, Yu. M.; Mal'kina, A. G.; Trofimov, B. A.; Kositsina, E. I.; Voronov, V. K.; Baikalova, L. V. Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, # 5 p. 1008 - 1014 Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 5 p. 1108 - 1115