Gallium nitride electrodes for membrane-based electrochemical biosensors T. Schubert, G. Steinhoff, H. -G. von Ribbeck, M. Stutzmannn, M. Eickhoff and M. Tanaka Eur. Phys. J. E, 30 2 (2009) 233-238 Published online: 03 September 2009 DOI: 10.1140/epje/i2009-10511-x