@misc{guhr_experience_made_1994, 
author={Guhr, H., Weber, E.},
title={Experience made with the sampling strategy in the river Elbe},
year={1994},
howpublished = {book part},
note = {Guhr, H.; Weber, E.: Experience made with the sampling strategy in the river Elbe. In: Markert, B. (Ed.): Environmental sampling for trace analysis. Weinheim: VCH. 1994.}}