1. Mokler, P.H., Stein, H.J., Armbruster, P.: Phys. Rev. Lett.29, 827 (1972)
2. Macdonald, J.R., Brown, M.D., Chiao, T.: Phys. Rev. Lett.30, 47 (1973)
3. Meyerhof, W.E., Saylor, T.K., Lazarus, S.M., Triplett, B.B., Chase, jr., L.F., Anholt, R.: Phys. Rev. Lett.32, 1279 (1974)
4. Frank, W., Gippner, P., Kaun, K.-H., Manfraß, P., Tretyakov, Yu.P.: Joint Inst. Nuc. Res. Dubna Publ. No. E7-9427 (1975) and E7-9065 (1975)
5. Kaun, K.-H., Frank, W., Manfraß, P.: In: Proc. of the Second International Conference on Inner-Shell Ionization, Mehlhorn, W., Ed. (University Freiburg, Freiburg, Germany) p. 68