Borovikova, G. S.; Tsymbal, I. F.; Levchenko, E. S.; Borovik, E. I.
Journal of Organic Chemistry USSR (English Translation), 1984 , p. 1626 - 1631
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 8 p. 1784 - 1790