1. Who Was Earnshaw?
2. R. E. Brown, inProceedings of the Second Conference on the Intersections between Particle and Nuclear Physics, Lake Louise, Canada, May 1986, edited by D. F. Geesaman (American Institute of Physics, New York, 1986), AIP Pub. No. 150, p. 436.
3. Finite length thermal equilibria of a pure electron plasma column
4. See also R. C. Davidson,Theory of Nonneutral Plasmas(Benjamin, Reading, MA, 1974).