Müller, H. W., & ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society (2014). Overview and comparison of resent results on plasma potential / Er diagnostic methods. Talk presented at Workshop on Electric Fields, Turbulence and Self-Organisation in Magnetised Plasmas (EFTSOMP). Satellite Meeting of EPS Conference. Berlin. 2014-06-30 - 2014-07-01.