@misc{richau_bipolar_membrane_2000, 
author={Richau, K.,Ziegler, J.},
title={Bipolar membrane characterization},
year={2000},
howpublished = {book part},
note = {Online available at: \url{} (DOI). Richau, K.; Ziegler, J.: Bipolar membrane characterization. In: Kemperman, A. (Ed.): Handbook on bipolar membrane technology. Twente University Press. 2000. 109-153.}}