1. Ullrich, J., Dörner, R., Lencinas, S., Jagutzki, O., Schmidt-Böcking, H in: Proceedings of the 11th Conference on the Application of Accelerators in Research and Industry, Denton 1990
2. Olson, R.E., in Electronic and Atomic Collisions, edited by Gilbody, H.B., Newell, W.R., Read, F.H., and Smith, A.C.H. (Elsevier, Amsterdam, 1988) pp. 271?285
3. Dörner, R., Ullrich, J., Schmidt-Böcking, H. and Olson, R.E. Phys.Rev.Lett.63,147(1989)
4. Salin, A., J.Phys. B: 22 (1989) 3901
5. Rudd, M.E., Toburen, L.H., Stolterfoht, N. At. Data and Nucl. Data Tables 18, (1976) 413