1. Krause, L.: In: The excited state in chemical physics, McGowan, J.W. (ed.), p 267. New York: Wiley 1975
2. Nikitin, E.E.: In: The excited state in chemical physics, McGowan, J.W. (ed.), p 317. New York: Wiley 1975
3. Arcuni, P.N., Troyer, M.L., Galagher, A.: Phys. Rev. A41, 2398 (1990)
4. Parker, J.W., Schuessler, H.A., Hill, R.H. Jr., Zollars, B.G.: Phys. Rev. A29, 617 (1984)
5. Supronowicz, J., Atkinson, J.B.; Krause, L.: Phys. Rev. A31, 2961 (1985)