Usov, V. A.; Dorofeev, I. A.; Timokhina, L. V.; Voronkov, M. G.
Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 3 p. 598 - 599
Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 3 p. 666 - 668