1. Stebbings, R.F., Dunning, F.B., Rundel, R.D.: Atomic Physics, Vol. 4, p. 713f. zu Putlitz, G., Weber, E.W., Winnacker, A. (eds.). New York: Plenum Press 1975
2. Ganz, J., Lewandowski, B., Siegel, A., Bussert, W., Waibel, H., Ruf, M.-W., Hotop, H.: J. Phys. B15, L485 (1982)
3. Siegel, A., Ganz, J., Bussert, W., Hotop, H.: J. Phys. B16, 2945 (1983)
4. Wang, L.-G., Knight, R.D.: Phys. Rev. A34, 3902 (1986)
5. Resonance Ionization Spectroscopy 1988, Lucatorto, T.B., Parks, J.E. (eds.), Proc. 4th Int. symp. on resonance ionization spectroscopy and its applications, Gaithersburg, Maryland, 1988. See e.g., Cannon, B.D., Janik, G.R., p. 217f.