1. K. Siegbahn , C.Nordling, G.Johansson, J.Hedman, P. F.Hedén, K.Hamrin, U.Gelius, T.Bergmark, L. O.Werme, R.Manne, and Y.Baer, ESCA Applied to Free Molecules, North-Holland Publishing Company, Amsterdam, 1971
2. A high resolution ESCA instrument with X-ray monochromator for gases and solids
3. Vibrational and lifetime line broadenings in ESCA
4. K. Siegbahn in Atomic Physics, ed. I. Lindgren, A. Rosén, and S. Svanberg, Plenum Press, New York, 1983, vol. 8, p. 243
5. Vibrational structure and lifetime broadening in core-ionised methane