1. A. Richardt, Thesis (Lyon, 1971);
2. R. Masic, J. M. Sautter, and R. J. Warnecke, Nucl. Instr. and Meth. 71, 339 (1969); NUIMAL0029-554X
3. M. Hashmi and A. J. Van der Houven van Oordt, Proc. 3rd Int. Conf. on Quiescent Plasmas—Elsinore (1971);
4. G. Sidenius, Proc. 1st Int. Conf. Ion Sources—Saclay (1969);
5. H. M. B. Bird and J. P. Flemming, J. Vac. Sc. Techn. 15, 1070 (1978).JVSTAL0022-5355