@misc{schroeder_contribution_of_1989, 
author={Schroeder, F.,Klages, D.,Knauth, H.-D.},
title={Contribution of sediments to the nitrogen budget of the Elbe estuary},
year={1989},
howpublished = {conference lecture: Munich (D); August 13-19, 1989},
note = {Online available at: \url{} (DOI). Schroeder, F.; Klages, D.; Knauth, H.: Contribution of sediments to the nitrogen budget of the Elbe estuary. 24th Congress of the International Association of Theoretical and Applied Limnology. Munich (D), 1989.}}