@misc{paul_membranes_and_1999, 
author={Paul, D.},
title={Membranes and Membrane Processes},
year={1999},
howpublished = {conference lecture: Berlin (D); 18.08.1999},
note = {Online available at: \url{} (DOI). Paul, D.: Membranes and Membrane Processes. 37th IUPAC Congress / 27th GDCh General Meeting, Education Course: Basic Research and Application of Membrane Separation Processes. Berlin (D), 1999.}}