@misc{richau_bipolar_membranes_1999, 
author={Richau, K.},
title={Bipolar membranes: preparation and characterization},
year={1999},
howpublished = {conference lecture (invited): Monte Verita, Ascona (CH); 14.-19.02.1999},
note = {Online available at: \url{} (DOI). Richau, K.: Bipolar membranes: preparation and characterization. Conference on Electroactive Membranes: From Fundamentals to Applications. Monte Verita, Ascona (CH), 1999.}}