@misc{betzel_seminar_zur_2002, 
author={Betzel, C.,Willumeit, R.},
title={Seminar zur strukturellen Biochemie},
year={2002},
howpublished = {lecture: TU Hamburg, FB Chemie; SS 2002},
note = {Online available at: \url{} (DOI). Betzel, C.; Willumeit, R.: Seminar zur strukturellen Biochemie. TU Hamburg, FB Chemie, 2002.}}