@misc{ohlrogge_membrane_technology_2002, 
author={Ohlrogge, K.,Wind, J.,Brinkmann, T.},
title={Membrane Technology for Natural Gas Processing},
year={2002},
howpublished = {conference lecture: Calgary (CDN); 30.04.-02.05.2002},
note = {Online available at: \url{} (DOI). Ohlrogge, K.; Wind, J.; Brinkmann, T.: Membrane Technology for Natural Gas Processing. Proceedings: SPE Gas Technology Symposium. Calgary (CDN), 2002.}}