1. Akhiezer, A. I., Akhiezer, I. A., Polovin, R. V., Sitepko, A. G., and Stepanov, K. N.: 1975, ?Plasma Electrodynamics?, Vol. 1, Linear Theory, Pergamon, Oxford.
2. Cargill, P. J. and Priest, E. R.: 1982, Solar Phys. 76, 357.
3. Cargill, P. J. and Priest, E. R.: 1983, Astrophys. J. 266, 383.
4. Forbes, T. G.: 1988a, Proc. Midnight Sun Conference on Activity in Cool Star Envelopes, Troms�, Norway.
5. ESA SP-275;G. G. Forbes,1988