1. Ashour-Abdalla, M., Cowley, S.W.H.: 1974, in B.M.McCormac (ed.), D. Reidel Publishing Company, Dordrecht-Holland, p. 270.
2. Ashour-Abdalla, M., Chanteur G., Pellat, R.: 1975, J. Geophys. Res. (in press).
3. Ashour-Abdalla, M., Kennel, C.F.: 1975a, Proceedings of the Nobel Symposium.
4. Ashour-Abdalla, M., Kennel, C.F.: 1975b, Proceedings of the Tenth Eslab Symposium.
5. Cornwall, J.M., Coroniti, Thorne, R.M.: 1970, J. Geophys. Res.
75, 4699.