@misc{petersen_ceramic_composite_1993, 
author={Petersen, G.,Jia, M.-D.,Peinemann, K.-V.,Behling, R.-D.},
title={Ceramic composite membranes for gas separation},
year={1993},
howpublished = {conference lecture: Heidelberg (D); 30. August-3. September 1993},
note = {Online available at: \url{} (DOI). Petersen, G.; Jia, M.; Peinemann, K.; Behling, R.: Ceramic composite membranes for gas separation. ICOM '93: The 1993 International Congress on Membranes and Membrane Processes. Heidelberg (D), 1993.}}