@misc{michaelis_trace_analytical_1991, 
author={Michaelis, W.},
title={Trace analytical chemistry at the GKSS Research Center},
year={1991},
howpublished = {conference lecture: Debrecen (H); 25.04.1991},
note = {Online available at: \url{} (DOI). Michaelis, W.: Trace analytical chemistry at the GKSS Research Center. Colloquium of the Kossuth University. Debrecen (H), 1991.}}