@misc{schwenke_total_reflection_1990, 
author={Schwenke, H.,Knoth, J.,Weisbrod, U.},
title={Total reflection x-ray fluorescence spectrometry, a new technique for quantitative surface analysis},
year={1990},
howpublished = {conference lecture: London (GB); November 13-16, 1990},
note = {Online available at: \url{} (DOI). Schwenke, H.; Knoth, J.; Weisbrod, U.: Total reflection x-ray fluorescence spectrometry, a new technique for quantitative surface analysis. Sixth International Conference for Quantitative Surface Analysis. London (GB), 1990.}}