1. Proc. 2d TXRF Workshop, Dortmund 1988;Spectrochim. Acta,1989
2. Proc. 3d TXRF Workshop, Vienna 1990;Spectrochim. Acta,1991
3. X-ray standing waves at a reflecting mirror surface
4. a W. Berneike, paper presented at 3d TXRF Workshop, Vienna 1990.
5. b H. Schwenke, paper presented at European EDXRF Workshop, Antwerp 1990.