@misc{willumeit_strukturbiochemie_i_2005, 
author={Willumeit, R.},
title={Strukturbiochemie I},
year={2005},
howpublished = {lecture: Universitaet Hamburg, FB Chemie; SS 2005},
note = {Online available at: \url{} (DOI). Willumeit, R.: Strukturbiochemie I. Universitaet Hamburg, FB Chemie, 2005.}}