Kirsch, S., Hanke-Rauschenbach, R., El-Sibai, A., Flockerzi, D., Krischer, K., & Sundmacher, K. (2011). The S-Shaped Negative Differential Resistance during the Electrooxidation of H2/CO in Polymer Electrolyte Membrane Fuel Cells: Modeling and Experimental Proof. The Journal of Physical Chemistry C, 115(51), 25315-25329. doi:10.1021/jp206660y.