1. M. D. Mashkovskii, Drugs [in Russian], Meditsina, Moscow (1998).
2. S. Tadashi, Jpn. Pat. 7207790; Chem. Abstr., 77, 5493 (1972).
3. V. P. Litvinov, Khim. Geterotsikl. Soedin., 12 (2002). [Chem. Heterocycl. Comp., 38, 9 (2002)].
4. I. S. Morozov, N. V. Klimova, N. P. Bykov, N. M. Zaitseva, G. V. Pushkar, E. D. Dvalishvili, A. A. Khranilov, and B. M. Pyatin, Khim. Farm. Zhurn., 25, No. 3, 29 (1991).
5. A. Padwa (editor), 1,3-Dipolar Cycloaddition Chemistry, Vol. 1, John Wiley and Sons Inc., New York (1984), p. 393.