1. Allen, C. W.: 1973, Astrophysical Quantities, 3rd ed., Athlone press, London, p. 170.
2. Cheng, C. C., Oran, E. S., Doscheck, G. A., Boris, J. P., and Mariska, J. T.: 1983, Astrophys. J. 265, 1090.
3. Emslie, A. G. and Sturrock, P. A.: 1982, Solar Phys. 80, 99.
4. Hénoux, J. C. and Nakagawa, Y.: 1977, Astron. Astrophys. 57, 105.
5. Hiei, E.: 1981, presented at the SMY Workshop, Annecy.