Mamedov, E. J.; Ismailov, A. G.; Kozhushkov, S. I.; Zefirov, N. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1992 , vol. 28, # 3 p. 260 - 265
Khimiya Geterotsiklicheskikh Soedinenii, 1992 , # 3 p. 313 - 319
McKeown, Neil B.; Chambrier, Isabelle; Cook, Michael J.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1990 , # 4 p. 1169 - 1177