@misc{willumeit_komplexe_systeme_2007, 
author={Willumeit, R.},
title={Komplexe Systeme},
year={2007},
howpublished = {lecture: Christian-Albrechts-Universitaet, FB Chemie; 16.-23.01. 2007},
note = {Online available at: \url{} (DOI). Willumeit, R.: Komplexe Systeme. Christian-Albrechts-Universitaet, FB Chemie, 2007.}}