1. Stezhko, T.V., Granik, V.G., Glushkov, R.G., Roshchina, L.F., Polezhaeva, A.I., and Mashkovskii, M.D., Khim.-Farm. Zh., 1984, p. 290.
2. Stezhko, T.V., Granik, V.G., Glushkov, R.G., Roshchina, L.F., Polezhaeva, A.I., and Mashkovskii, M.D., Khim.-Farm. Zh., 1984, p. 823.
3. Stezhko, T.V., Granik, V.G., Glushkov, R.G., Roshchina, L.F., Polezhaeva, A.I., and Mashkovskii, M.D., Khim.-Farm. Zh., 1984, p. 1198.
4. Sedavkina, V.A., Lizak, I.V., and Sorokin, N.N., Khim. Geterotsikl. Soedin., 1987, p. 1405.
5. Sedavkina, V.A., Morozova, N.A., and Egorova, A.Yu., Khim. Geterotsikl. Soedin., 1993, p. 456.