1. Andrews, J.G., and Allen, J.E., 1977, Proc. Ray. Soc. Lond. A., 320, 459.
2. Block, L.P., 1972, Potential double layers in the ionosphere, Cosmic Electrodynamics, 3, 349.
3. Borovsky, J.E., and Joyce, G., 1982a, The simulation of plasma double-layer structures in two dimension, J. Plasma Phys., (submitted).
4. Borovsky, J.E., and Joyce, G., 1982b, Numerically simulated two-dimensional auroral double layers, J. Geophys. Res., (submitted).
5. Burger, P., 1965, Theory of large-amplitude oscillations in the one-dimensional low-pressure cesium thermionic converter, J. Appl. Phys., 36, 1938.