1. Trofimov, B.A., Kalabin, G.A., Atavin, A.S., Mikhaleva, A.I., and Chebotareva, E.G., Khim. Geterotsikl. Soedin., 1975, p. 360.
2. Trofimov, B.A., Sigalov, M.V., Bzhezovskii, V.M., Kalabin, G.A., Mikhaleva, A.I., and Vasil’ev, A.N., Khim. Geterotsikl. Soedin., 1978, p. 350.
3. Sigalov, M.V., Kalabin, G.A., Mikhaleva, A.I., and Trofimov, B.A., Khim. Geterotsikl. Soedin., 1980, p. 328.
4. Sigalov, M.V., Shainyan, B.A., Kalabin, G.A., Mikhaleva, A.I., and Trofimov, B.A., Khim. Geterotsikl. Soedin., 1980, p. 627.
5. Sigalov, M.V., Trofimov, B.A., Mikhaleva, A.I., and Kalabin, G.A., Tetrahedron, 1981, vol. 37, p. 3051.