@misc{almasri_new_polymides_1999, 
author={Al-Masri, M.,Kricheldorf, H.R. and ,Fritsch, D.},
title={New Polymides for Gas Separation I: Polymides Derived from Substituted Terphenylenes and 4,4´-(Hexafluoroisopropylidene)diphthalic anhydride},
year={1999},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Al-Masri, M.; Kricheldorf, H.; Fritsch, D.: New Polymides for Gas Separation I: Polymides Derived from Substituted Terphenylenes and 4,4´-(Hexafluoroisopropylidene)diphthalic anhydride. Macromolecules. 1999. vol. 32, no. 23, 7853-7858.}}