@misc{tietgens_an_attempt_1990, 
author={Tietgens, B.,Eisold, C.,Hicke, H.-G.},
title={An attempt to distinguish between very porous ultrafiltration and microfiltration membranes},
year={1990},
howpublished = {conference lecture: Prag (CZ); September 1990},
note = {Online available at: \url{} (DOI). Tietgens, B.; Eisold, C.; Hicke, H.: An attempt to distinguish between very porous ultrafiltration and microfiltration membranes. CHISA-Kongress. Prag (CZ), 1990.}}