Kovalenko, A. L.; Serov, Yu. V.; Nikonov, A. A.; Tselinskii, I. V. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 10 p. 1835 - 1837 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 10 p. 2074 - 2077