Schumacher, U. Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;
Barnsley, R., Schumacher, U., Kaellne, E., & et al. (1989). Radiation-Shielded Double Crystal X-Ray Monochromator for JET. 16. European Conference on Controlled Fusion and Plasma Physics, 13B, 4, 1557-1560.