Beurskens, M. N. A., Dunne, M. G., Frassinetti, L., Bernert, M., Cavedon, M., Fischer, R., Järvinen, A., Kallenbach, A., Laggner, F. M., McDermott, R. M., Potzel, S., Schweinzer, J., Tardini, G., Viezzer, E., Wolfrum, E., ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, & EUROfusion MST1 Team (2016). The role of carbon and nitrogen on the H-mode confinement in ASDEX Upgrade with a metal wall. Nuclear Fusion, 56:. doi:10.1088/0029-5515/56/5/056014.