Greuner, H., Glagla, J., Jandl, O., Mendelevitch, B., Renner, H., & Rieck, R. (2001). Concepts and prototype elements of the low-Z wall protection for the stellarator W7-X. Fusion Engineering and Design, 56-57, 297-302. Retrieved from http://dx.doi.org/10.1016/S0920-3796(01)00312-X.