Sapper, J. W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society; Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Sapper, J. (n.d.). Technical Evaluation of W 7-X Coils. In Proc.of the 5th Workshop on Wendelstein 7-X (pp. 123-130).