@misc{paul_membranes_in_1998, 
author={Paul, D.},
title={Membranes in clean production},
year={1998},
howpublished = {conference lecture: Geesthacht (D);},
note = {Paul, D.: Membranes in clean production. Advanced Course on the Use of Membrane Technology in Environmental Applications. Membrane Technology in the Chemical Industry: Current Applications and Perspectives (ACUMTEA). Geesthacht (D), 1998.}}