@misc{paul_clean_production_1998, 
author={Paul, D.},
title={Clean Production with Membrane Technology},
year={1998},
howpublished = {conference lecture (invited): Beijing (VRC); June 9-13, 1998},
note = {Online available at: \url{} (DOI). Paul, D.: Clean Production with Membrane Technology. International Conference on Membrane Science and Technology (ICMST '98). Beijing (VRC), 1998.}}