@misc{ohlrogge_natural_gas_2001, 
author={Ohlrogge, K.,Wind, J.,Brinkmann, T.,Peinemann, K.-V.},
title={Natural Gas Clean-up by means of Membranes},
year={2001},
howpublished = {conference lecture (invited): Barga (I); 14.-19.10.2001},
note = {Online available at: \url{} (DOI). Ohlrogge, K.; Wind, J.; Brinkmann, T.; Peinemann, K.: Natural Gas Clean-up by means of Membranes. Engineering Foundation Conference ' Advanced Membrane Technology '. Barga (I), 2001.}}