Hedges R.M., R.T. Skodje, F. Borondo, and W.P. Reinhardt, in Resonances (American Chemical Society, 1984), pp. 323-336.
Skodje R.T., R. Sadeghi, H. Köppel, and J.L. Krause, The Journal Of Chemical Physics 101, 1725 (1994).