@misc{willumeit_praktikum_proteinchemie_1999, 
author={Willumeit, R.},
title={Praktikum Proteinchemie III},
year={1999},
howpublished = {lecture: Universitaet Hamburg; 28.06.-02.07.1999},
note = {Online available at: \url{} (DOI). Willumeit, R.: Praktikum Proteinchemie III. Universitaet Hamburg, 1999.}}