@misc{paul_application_of_1991, 
author={Paul, D.},
title={Application of polymer membranes in separation processes},
year={1991},
howpublished = {conference lecture (invited): Calcutta (IND); 19.-21.12.1991},
note = {Online available at: \url{} (DOI). Paul, D.: Application of polymer membranes in separation processes. Downstream Processing in Biotechnology. Calcutta (IND), 1991.}}