1. On ion sources with high efficiency and intensity
2. Proc. Symp. Ion sources;Lejeune,1971
3. Proc. Symp. Ion sources;Knauer,1971
4. T. S. Green and C. Goble, Power and particle flux balance in a P.I.G. discharge ion source, C.L.M. (to be published).
5. Proc. 2nd Int. Conf. Ion sources;Ehlers,1972