@misc{michaelis_trace_analysis_1988, 
author={Michaelis, W.,Prange, A.},
title={Trace analysis of geological and environmental samples by total-reflection X-ray flourescence spectrometry},
year={1988},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Michaelis, W.; Prange, A.: Trace analysis of geological and environmental samples by total-reflection X-ray flourescence spectrometry. Nuclear Geophysics. 1988. vol. 2, no. 4, 231-245.}}