Beidler, C. D., Feng, Y., Geiger, J., Köchl, F., Maaßberg, H., Marushchenko, N. B., et al. (2018). (Expected difficulties with) density-profile control in W7-X high-performance plasmas. Plasma Physics and Controlled Fusion, 60: 105008. doi:10.1088/1361-6587/aad970.