@misc{ziemer_directional_spectra_1989, 
author={Ziemer, F.},
title={Directional spectra from shipboard navigation radar},
year={1989},
howpublished = {conference lecture: Baltimore, MD (USA); 19.04.1989},
note = {Online available at: \url{} (DOI). Ziemer, F.: Directional spectra from shipboard navigation radar. LEWEX Symposium. Baltimore, MD (USA), 1989.}}