@misc{fritsch_polyimide_membranes_1999, 
author={Fritsch, D.},
title={Polyimide Membranes for Gas Separation},
year={1999},
howpublished = {conference lecture: Berlin (D); 18.08.1999},
note = {Online available at: \url{} (DOI). Fritsch, D.: Polyimide Membranes for Gas Separation. 37th IUPAC Congress / 27th GDCh General Meeting; Education Course: Basic Research and Application of Membrane Separation Processes. Berlin (D), 1999.}}