@misc{prange_determination_of_1991, 
author={Prange, A.,Kramer, K.,Reus, U.},
title={Determination of trace element impurities in ultrapure reagents by total reflection X-ray spectrometry},
year={1991},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Prange, A.; Kramer, K.; Reus, U.: Determination of trace element impurities in ultrapure reagents by total reflection X-ray spectrometry. Spectrochimica Acta  B. 1991. vol. 46, no. 10, 1385-1393.}}