@misc{gertelkloos_mathematik_fuer_1993, 
author={Gertel-Kloos, H.},
title={Mathematik fuer Bauingenieure},
year={1993},
howpublished = {lecture: Fachhochschule Luebeck; 1993},
note = {Online available at: \url{} (DOI). Gertel-Kloos, H.: Mathematik fuer Bauingenieure. Fachhochschule Luebeck, 1993.}}