Shugalei, I. V.; Tselinskii, I. V.; Bazanov, A. G. Journal of Organic Chemistry USSR (English Translation), 1986 , vol. 22, # 12 p. 2242 - 2246 Zhurnal Organicheskoi Khimii, 1986 , vol. 22, # 12 p. 2496 - 2501