@misc{paul_membranes_for_1999, 
author={Paul, D.},
title={Membranes for Separation Processes},
year={1999},
howpublished = {conference lecture (invited): Berlin (D); 17.08.1999},
note = {Online available at: \url{} (DOI). Paul, D.: Membranes for Separation Processes. 37th IUPAC Congress / 27th GDCh General Meeting; Session: Macromolecular Chemistry. Berlin (D), 1999.}}