@misc{hagner_how_international_2001, 
author={Hagner, C.},
title={How International Policies Affect the Management of Dredged Material in the Area of the North Sea},
year={2001},
howpublished = {GKSS report},
note = {Hagner, C.: How International Policies Affect the Management of Dredged Material in the Area of the North Sea. GKSS 2001-13. 2001.}}