1. Dvorko, G.F. and Zhovtyak, V.N., Zh. Obshch. Khim., 1988, vol. 58, no. 1, p. 165.
2. Dvorko, G.F., Ponomareva, E.A. Ponomarev, N.E., Zaliznyi, V.V., and Koshchii, I.V., Zh. Obshch. Khim., 2007, vol. 77, no. 9, p. 1462.
3. Dvorko, G.F. and Ponomarev, N.E., Zh. Obshch. Khim., 1995, vol. 65, no. 1, p. 128.
4. Salem, L., Electrons in Chemical Reactions, First Principles, Moscow: Mir, 1985.
5. Cremaschi, P., Gamba, A., and Simonetta, M., J. Chem. Soc., Perkin Trans. 2, 1977, no. 1, p. 162.