@misc{callies_variational_data_1989, 
author={Callies, U., Eppel, D. P.},
title={Variational data assimilation into a shallow water model},
year={1989},
howpublished = {conference lecture: Norman, OK (USA);},
note = {Callies, U.; Eppel, D.: Variational data assimilation into a shallow water model. Second STORM workshop on regional data assimilation. Norman, OK (USA), 1989.}}