1. K. Fukui, J. Phys. Chem., 74, 4161 (1970).
2. A. Tachibana and K. Fukui, Theor. Chim. Acta, 51,189 (1979).
3. G. Leroy, M. Sana, L.A. Burke, and M.-T. Nguyen, in Quantum Theory of Chemical Reactions, R. Daudel, A. Pullman, L. Salem, and A. Veillard, Eds., Reidel, Dordrecht, 1979.
4. W.H. Miller, N.C. Henry, and J.E. Adams, J. Chem. Phys., 72, 99 (1980).
5. K. Fukui, Acc. Chem. Res., 14, 363 (1981).