Vasil'eva, L. P.; Akimova, G. S.; Chistokletov, V. N. Journal of Organic Chemistry USSR (English Translation), 1987 , vol. 23, # 9 p. 1776 - 1781 Zhurnal Organicheskoi Khimii, 1987 , vol. 23, # 9 p. 2008 - 2014