1. Culvenor, C.C.J., Davies, W., Maclaren, J.A., Nelson, P.F., and Savige, W.E., J. Chem. Soc., 1949, p. 2573.
2. Omar, M.T. and Kasem, M.A., J. Heterocyclic Chem., 1981, vol. 18, no. 7, p. 1413.
3. Fedoseev, V.M., Mandrugin, A.A., and Semenenko, M.N., Khim. Geterotsikl. Soedin., 1984, no. 1, p. 44.
4. Rodyunin, A.A., Mandrugin, A.A., and Fedoseev, V.M., Abstracts of Papers, I Vsesoyuznaya konferentsiya po teoreticheskoi organicheskoi khimii (I All-Union Conf. on Theoretical Organic Chemistry), Volgograd, 1991, p. 159.
5. Mandrugin, A.A., Fedoseev, V.M., Khomutov, S.M., and Roshchina, T.M., Abstracts of Papers, I Vsesoyuznaya konferentsiya po teoreticheskoi organicheskoi khimii (I All-Union Conf. on Theoretical Organic Chemistry), Volgograd, 1991, p. 158.