Kirillova, K. M.; Skvortsova, T. A.; Nikonova, L. Z.; Chugunov, Yu. V.; Igonin, V. B.; Mukhtarov, A. Sh. Journal of Organic Chemistry USSR (English Translation), 1992 , vol. 28, # 3.1 p. 427 - 430 Zhurnal Organicheskoi Khimii, 1992 , vol. 28, # 3 p. 527 - 530