@misc{ulbricht_polyacrylonitrile_enzyme_1997, 
author={Ulbricht, M., Papra, A.},
title={Polyacrylonitrile enzyme ultrafiltration membranes prepared by adsorption, cross-linking, and covalent binding},
year={1997},
howpublished = {journal article},
note = {Ulbricht, M.; Papra, A.: Polyacrylonitrile enzyme ultrafiltration membranes prepared by adsorption, cross-linking, and covalent binding. Enzyme and Microbial Technology. 1997. vol. 20, 61-68.}}