1. Rakhmankulov, D.L., Zorin, V.V., Latypova, F.N., Zlotskii, S.S., and Karakhanov, R.A., Usp. Khim., 1983, vol. 52, no. 6, p. 619.
2. Turyanskaya, A.M. and Kuznetsov, V.V., Khim. Geterotsikl. Soed., 2002, no. 5, p. 692.
3. Turyanskaya, A.M., Novikov, A.N., Verkhivker, G.M., and Kuznetsov, V.V., Zh. Obshch. Khim., 2001, vol. 71, no. 9, p. 1571.
4. HyperChem 7.01. Trial version. www.hyper.com .
5. Pihlaja, K., Pasanen, P., and Wähäsilta, J., Org. Mag. Res., 1979, vol. 12, no. 5, p. 331.