@misc{paul_polymere_fuer_1999, 
author={Paul, D.},
title={Polymere fuer die Membrantechnik},
year={1999},
howpublished = {lecture: TU Berlin; SS 1999},
note = {Online available at: \url{} (DOI). Paul, D.: Polymere fuer die Membrantechnik. TU Berlin, 1999.}}