1. Grashey, R., 1,3-Dipolar Cycloaddition Chemistry, Padwa, A., Ed., New York: Wiley, 1984, chap. 1, p. 733; Rodina, L.L., Kolberg, A., and Schulze, B., Heterocycles, 1998, vol. 49, p. 587.
2. Koptelov, Yu.B., Kim, M.Kh., Molchanov, A.P., and Kostikov, R.R., Russ. J. Org. Chem., 1999, vol. 35, p. 110.
3. Trofimov, V.V., Koptelov, Yu.B., Molchanov, A.P., and Kostikov, R.R., Zh. Org. Khim., 1994, vol. 30, p. 1389.
4. Molchanov, A.P., Sipkin, D.I., Koptelov, Yu.B., and Kostikov, R.R., Russ. J. Org. Chem., 2001, vol. 37, p. 841.
5. Schulz, M. and West, G., J. Prakt. Chem., 1970, vol. 312, p. 161; Geissler, G., Menz, I., Angermüller, K., and Tomaschewski, G., J. Prakt. Chem., 1983, vol. 325, p. 197; Geissler, G., Fust, W., Krüger, B., and Tomaschewski, G., J. Prakt. Chem., 1983, vol. 325, p. 205.