Neu, R., Asmussen, K., Fussmann, G., Geltenbort, P., Janeschitz, G., Schönmann, K., et al. (1996). Monitor for the carbon and oxygen impurities in the ASDEX Upgrade tokamak. Review of Scientific Instruments, 67(5), 1829-1833. doi:10.1063/1.1147522.