@misc{guenther_assimilation_of_1992, 
author={Guenther, H., Lionello, P., Janssen, P. A. E. M.},
title={Assimilation of altimeter data in a global third generation wave model (ECMWF-67)},
year={1992},
howpublished = {GKSS report},
note = {Guenther, H.; Lionello, P.; Janssen, P.: Assimilation of altimeter data in a global third generation wave model (ECMWF-67). Zugl.: GKSS 92-E-96. 1992.}}