1. RF Ion Sources for Fusion Applications: Design, Development and Performance;Speth;Fusion Engineering and Design,1999
2. O. Vollmer, A. Stäbler, E. Speth, M. Ciric, P. Franzen, B. Heinemann, W. Kraus, W. Melkus, R. Riedl, W. Schärich, Commissioning and performance of the new ASDEX upgrade neutral beam injector, Proc. 20th SOFT, Fusion Technology, vol. 1, (1998) 449.
3. P. McNeely et al, Proc. 21th SOFT (2000), to be published.
4. W. Ott, F.-P. Penningsfeld: Spectroscopic Determination of Species and Divergence of Hydrogen Beams in the W7AS Neutral Beam Injectors, Report IPP 4/258, Max-Planck-Institut für Plasmaphysik (1993).
5. Development of large Radio Frequency driven negative Ion Sources for Fusion;Vollmer;Rev. Sci. Instrum.,2000