1. Freedman, T. B. and Nafie, L. A. (1994) in M. Evans and S. Kielich (eds.) Advances in Chemical Physics, Vol. 85, Modern Nonlinear Optics, Part 3 Wiley, New York, pp.207–263.
2. Keiderling, T. A. and Pancoska, P. (1993) in R. J. H. Clark and R. E. Hester (eds.), Advances in Spectroscopy Vol. 21, John Wiley and Sons, Chichester, pp. 267–315.
3. Freedman, T. B., Ragunathan, N. and Alexander, S. (1995) Faraday Discuss. 99, (in press).
4. Freedman, T. B., Nafie, L. A. and Yang, D. (1994) Chem. Phys. Lett. 227, 419–428.