Grassmann, P. Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;
Grassmann, P. (1966). Measurements of the Radial Defendence of the Number Density of Free Electrons and Electron Temperature in an "Eieruhr" Plasma. In First European Conference on Controlled Fusion and Plasma Physics (pp. 98-98).