Tolstikov, G. A.; Ismailov, S. A.; Prishchepova, E. V.; Miftakhov, M. S. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 9.2 p. 1783 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 9 p. 2015 - 2016