@misc{nagel_free_volume_2002, 
author={Nagel, C., Guenther-Schade, K., Fritsch, D., Strunskus, T., Faupel, F.},
title={Free volume and transport properties in highly selective polymer membranes},
year={2002},
howpublished = {journal article},
note = {Nagel, C.; Guenther-Schade, K.; Fritsch, D.; Strunskus, T.; Faupel, F.: Free volume and transport properties in highly selective polymer membranes. Macromolecules. 2002. vol. 35, no. 6, 2071-2077.}}