@misc{graber_numerical_simulations_1990, 
author={Graber, H. C.,Bymann, M. W.,Rosenthal, W.},
title={Numerical simulations of surface wave refraction in the North Sea; Part 1: Kinematics},
year={1990},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Graber, H.; Bymann, M.; Rosenthal, W.: Numerical simulations of surface wave refraction in the North Sea; Part 1: Kinematics. Deutsche Hydrographische Zeitschrift / German Journal of Hydrography. 1990. vol. 43, 1-8.}}