1. G. Benford, D. L. Book, N. C. Christofilos, T. K. Fowler, V. K. Niel, and L. D. Pearlstein, inPlasma Physics and Controlled Nuclear Fusion Research(International Atomic Energy Agency, Vienna, 1967), Vol. I, p. 981.
2. Return Current Induced by a Relativistic Beam Propagating in a Magnetized Plasma
3. Interaction of a rotational relativistic electron beam with a magnetized plasma
4. see also K. Molvig, N. Rostoker, and F. Dothan, inPlasma Physics and Controlled Nuclear Fusion Research(International Atomic Energy Agency, Vienna, 1975), Vol. III, p. 249.