@misc{ohlrogge_membrane_processes_2003, 
author={Ohlrogge, K.,Wind, J.,Brinkmann, T.},
title={Membrane processes in natural gas conditioning},
year={2003},
howpublished = {conference lecture (invited): Aachen (D); 18.-20.03.2003},
note = {Online available at: \url{} (DOI). Ohlrogge, K.; Wind, J.; Brinkmann, T.: Membrane processes in natural gas conditioning. 9. Aachener Membran Kolloquium. Aachen (D), 2003.}}