Riedmüller, W. Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;
Riedmüller, W. (1965). Messungen der Elektronentemperatur in einem Argon-Kalium-Plasma. - Measurements of Electron Temperature in an Argon-Potassium-Plasma. Diploma Thesis, Max-Planck-Institut für Plasmaphysik, Garching (DE).