@misc{michaelis_trace_analysis_1991, 
author={Michaelis, W.},
title={Trace analysis of geological and environmental samples},
year={1991},
howpublished = {conference lecture: Dresden (D);},
note = {Michaelis, W.: Trace analysis of geological and environmental samples. In: Ernst-Moritz-Arndt-Universitaet Greifswald (Ed.): Proceedings of the 7th EUROCLAY Conference. Dresden (D). 1991. 761-766.}}