Kyaerd, A. Ya.; Kestner, A. I.; Siimer, E. Kh.
Journal of Organic Chemistry USSR (English Translation), 1987 , vol. 23, # 8 p. 1497 - 1502
Zhurnal Organicheskoi Khimii, 1987 , vol. 23, # 8 p. 1671 - 1677