1. Stability of laminar electron layers
2. PHERMEX Standing-Wave Linear Electron Accelerator
3. J. C. Maxwell,Scientific Papers(Cambridge U.P., Cambridge, 1890), Vol. 1, p. 288.
4. C. E. Nielsen, A. M. Sessler, and K. R. Symon, inProceedings of the International Conference on High-Energy Accelerators and Instrumentation(CERN, Geneva, 1959), p. 239.