@misc{schafstall_seminar_tauchtechnik_1991, 
author={Schafstall, H.-G.},
title={Seminar Tauchtechnik},
year={1991},
howpublished = {lecture: Universitaet Hamburg; 1991},
note = {Online available at: \url{} (DOI). Schafstall, H.: Seminar Tauchtechnik. Universitaet Hamburg, 1991.}}