Wenzel, U., Carlson, A., Fuchs, C., Kastelewicz, H., & Napiontek, B. (1999). Spectroscopic study of the radiation in divertor I of ASDEX Upgrade at high density. Plasma Physics and Controlled Fusion, 41(6), 801-818. doi:10.1088/0741-3335/41/6/308.