1. R. A. Dandl, H. O. Eason, A. C. England, G. E. Guest, C. L. Hedrick, H. Ikegami, and D. B. Nelson, in Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1975), Vol. II, p. 141.
2. J. C. Glowienka, J. Vac. Sci. Technol. 18, 1088 (1981).JVSTAL0022-5355
3. R. A. Dandl, J. L. Dunlap, H. O. Eason, P. H. Edmonds, A. C. England, W. J. Hermann, and N. H. Lazar, in Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1969), Vol. II, p. 435;
4. R. A. Dandl, H. O. Eason, P. H. Edmonds, A. C. England, G. E. Guest, C. L. Hedrick, J. T. Hogan, and J. C. Sprott, in Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1972), Vol. II, p. 607.
5. D. L. Hillis, in Proceedings of the Second Workshop on Hot Electron Ring Physics, edited by N. A. Uckan (Oak Ridge National Laboratory, Oak Ridge, TN, 1981), p. 317.