@misc{colijn_use_of_2002, 
author={Colijn, F.},
title={Use of ships-of-opportunity for monitoring and eutrophication of the Wadden Sea},
year={2002},
howpublished = {conference lecture: Gdansk (PL); 04.-06.11.2002},
note = {Online available at: \url{} (DOI). Colijn, F.: Use of ships-of-opportunity for monitoring and eutrophication of the Wadden Sea. Vortrag an der Universitaet Danzig. Gdansk (PL), 2002.}}