@misc{krohn_mathematical_modelling_1990, 
author={Krohn, J.,Duwe, K.},
title={Mathematical modelling of hydrodynamics in the Elbe estuary},
year={1990},
howpublished = {book part},
note = {Online available at: \url{} (DOI). Krohn, J.; Duwe, K.: Mathematical modelling of hydrodynamics in the Elbe estuary. In: Michaelis, W. (Ed.): Estuarine water quality management: monitoring, modelling and research - Coastal and estuarine studies. Berlin: Springer. 1990. 35-40.}}