@misc{boeddeker_membrantechnik__1991, 
author={Boeddeker, K.W.},
title={Membrantechnik},
year={1991},
howpublished = {lecture: Technische Universitaet Hamburg-Harburg; 1991},
note = {Online available at: \url{} (DOI). Boeddeker, K.: Membrantechnik. Technische Universitaet Hamburg-Harburg, 1991.}}