1. G. F. Francis, inHandbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, 1956), Vol. 22, p. 53.
2. A. B. Mikhailovskii,Theory of Plasma Instabilities(Consultants Bureau, New York, 1974), Vol. 1, p. 159.
3. Electron Echo Experiment 1: Comparison of observed and theoretical motion of artificially injected electrons in the magnetosphere
4. B. B. Kadomtsev,Plasma Turbulence(Academic, New York, 1965), p. 68.