@misc{paul_polymermembranen_fuer_1998, 
author={Paul, D.},
title={Polymermembranen fuer die Stofftrennung},
year={1998},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Paul, D.: Polymermembranen fuer die Stofftrennung. Chemie in unserer Zeit. 1998. vol. 32, no. 4, 197-205.}}