Saginova. L. G.; Bondarenko, O. B.; Shabarov, Yu. S.; Gazzaev, R. A. Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 1935 - 1939 Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 10 p. 2124 - 2129