Levchenko, E. S.; Pel'kis, N. P.
Journal of Organic Chemistry USSR (English Translation), 1982 , vol. 18, # 2 p. 398
Zhurnal Organicheskoi Khimii, 1982 , vol. 18, # 2 p. 453 - 454

Naik
Journal of the Chemical Society, 1921 , vol. 119, p. 1169

Borovikova,G.S. et al.
Zhurnal Organicheskoi Khimii, 1979 , vol. 15, p. 479 - 485,424 - 429

Barashenkov, G. G.; Derkach, N. Ya.; Levchenko, E. S.; Kalinin, V. N.
Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 468 - 473
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 3 p. 519 - 524