1. Ostrovskii, V.A., Koldobskii, G.I., and Trifonov, R.E., Comprehensive Heterocyclic Chemistry III, Katritzky, A.R., Ramsden, C.A., Scriven, E.F.V, and Taylor, R.J.K., Eds., Amsterdam: Elsevier, 2008, vol. 6, p. 257.
2. Koldobskii, G.I., Ostrovskii, V.A., and Poplavskii, V.S., Khim. Geterotsikl. Soedin., 1981, p. 1299.
3. Noodleman, L., Lovell, T., Han, W.-G., Li, J., and Himo, F., Chem. Rev., 2004, vol. 104, p. 459.
4. Ostrovskii, V.A., Poplavskii, V.S., Koldobskii, G.I., and Erusalimskii, G.B., Khim. Geterotsikl. Soedin., 1992, p. 1214.
5. Titova, I.E., Poplavskii, V.S., Koldobskii, G.I., Ostrovskii, V.A., Nikolaev, V.D., and Erusalimskii, G.B., Khim. Geterotsikl. Soedin., 1986, p. 1086.