@misc{schroeder_contribution_of_1991, 
author={Schroeder, F., Klages, D., Knauth, H.-D.},
title={Contribution of sediments to the nitrogen budget of the Elbe estuary},
year={1991},
howpublished = {journal article},
note = {Schroeder, F.; Klages, D.; Knauth, H.: Contribution of sediments to the nitrogen budget of the Elbe estuary. Verhandlungen (Internationale Vereinigung fuer  theoretische und angewandte Limnologie). 1991. vol. 24, 6318-6322.}}