1. S. Hüfner, Photoelectron Spectroscopy (Springer, Berlin, 2003)
2. M. Cardona, L. Ley, Topics Appl. Phys., Vol. 26 (Springer, Berlin, Heidelberg, 1978)
3. J.W. Allen, Synchrotron Radiation Research, Advances in Surface and Interface Science, Vol. 1, Techniques, edited by R.Z. Bachrach (Plenum, New York, 1992)
4. C.S. Fadley, Electron Spectroscopy, Theory, Techniques and Applications, Vol. II (Academic, New York, 1978)
5. S. Tanuma, C.J. Powell, D.R. Penn, Surf. Interface Anal. 21, 165 (1993)