@misc{fanger_hydra_hydrographic_1992, author={Fanger, H.-U.}, title={HYDRA: hydrographic measurement system}, year={1992}, howpublished = {conference lecture: Geesthacht (D); 9.-10. September 1992}, note = {Online available at: \url{} (DOI). Fanger, H.: HYDRA: hydrographic measurement system. French-German Workshop on Marine Monitoring/Sur-veillance Systems and Technologies. Geesthacht (D), 1992.}}