@misc{szelagowski_unterwassertechnik_i_1993, 
author={Szelagowski, P.},
title={Unterwassertechnik I},
year={1993},
howpublished = {lecture: Universitaet Hamburg, FB Schiffbau; WS 1993},
note = {Online available at: \url{} (DOI). Szelagowski, P.: Unterwassertechnik I. Universitaet Hamburg, FB Schiffbau, 1993.}}