@misc{prange_determination_of_1990, 
author={Prange, A.,Kramer, K.,Reus, U.},
title={Determination of trace element impurities in ultrapure acids by totalreflection X-ray fluorescence analysis},
year={1990},
howpublished = {conference poster: Antwerpen (B); 20.-22. Juni 1990},
note = {Online available at: \url{} (DOI). Prange, A.; Kramer, K.; Reus, U.: Determination of trace element impurities in ultrapure acids by totalreflection X-ray fluorescence analysis. In: European EDXRF-Workshop. Antwerpen (B). 1990.}}