Tomilov, Yu. V.; Kostitsyn, A. B.; Shulishov, E. V.; Nefedov, O. M.
Synthesis, 1990 , # 3 p. 246 - 248

Monich, N. V.; Lyubich, M. S.; Larina, S. M.; Khusid, A. Kh.
Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 9.2 p. 1761 - 1766
Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 9 p. 1991 - 1996