Adamek, J., Horacek, J., Seidl, J., Müller, H. W., Schrittwieser, R., Mehlmann, F., et al. (2013). Plasma potential measurements by ball-pen probe and self-emitting probe on COMPASS and ASDEX Upgrade. Talk presented at 10th International Workshop on Electric Probes in Magnetized Plasmas (IWEP 2013). Madrid. 2013-07-09 - 2013-07-12.