1. Antiochos, S. K. and Sturrock, P. A.: 1976, Solar Phys. 49, 359.
2. Athay, R. G.: 1976, The Solar Chromosphere and Corona: the Quiet Sun, D. Reidel Publ. Co., Dordrecht, Holland, p. 314.
3. Canfield, R. C., Brown, J. C., Brueckner, G. E., Cook, J. W., Craig, I. J. D., Doschek, G. A., Emslie, A. G., H�noux, J.-C, Lites, B. W., Machado, M. E., and Underwood, J. H.: 1980, in P. A. Sturrock (ed.), Solar Flares - A Monograph from Skylab Solar Workshop II, Boulder, Colorado Associated Press.
4. Cook, J. W.: 1979, Astrophys. J. 234, 378.
5. Cook, J. W. and Brueckner, G. E.: 1979, Astrophys. J. 227, 645.