1. J. M. Baird, in High Power Microwave Sources, edited by V. L. Granatstein and I. Alexeff (Artech House, Norwood, 1987), Chap. 4, p. 103.
2. C. E. Nielson, A. M. Sessler, and K. R. Simon, Proceedings of the International Conference on High-Energy Accelerators and Instrumentation (CERN, Geneva, 1959), p. 239;
3. A. A. Kolomenskii and A. N. Lebedev, Proceedings of the International Conference on High-Energy Accelerators and Instrumentation (CERN, Geneva, 1959), p. 115.
4. Stability of laminar electron layers