@misc{guhr_gewaesserforschung_in_1992, 
author={Guhr, H.,Klapper, H.,Meissner, R.},
title={Gewaesserforschung in Magdeburg},
year={1992},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Guhr, H.; Klapper, H.; Meissner, R.: Gewaesserforschung in Magdeburg. AGF-Jahresheft. 1992. 41-43.}}