Poschenrieder, W., Behringer, K., Bosch, H. S., Field, A., Kallenbach, A., Kaufmann, M., Krieger, K., Küppers, J., Lieder, G., Naujoks, D., Neu, R., Neuhauser, J., Garcia-Rosales, C., Roth, J., Schneider, R., & ASDEX Upgrade Team (1995). Molecular impurities in ASDEX UPGRADE plasma discharges. Journal of Nuclear Materials, 220-222, 36-49. doi:10.1016/0022-3115(94)00445-5.