@misc{schwenke_treatment_of_1992, 
author={Schwenke, H.,Gutschke, R.,Knoth, J.,Kock, M.},
title={Treatment of roughness and concentration gradients in total reflection X-ray fluorescence analysis of surfaces},
year={1992},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Schwenke, H.; Gutschke, R.; Knoth, J.; Kock, M.: Treatment of roughness and concentration gradients in total reflection X-ray fluorescence analysis of surfaces. Applied Physics  A. 1992. vol. 54, 460-465.}}