1. Baliunas, S.L. & Vaughan, A.H., 1985. Ann. Rev. Astron. Astrophys., 23, 379.
2. Boyer, D.W. & Levy, E.H., 1984. Astrophys. J., 277, 848.
3. Cameron, A. and 5 others, 1986. In: Cool Stars, Stellar Systems & the Sun, eds Zeilik, M. & Gibson, D.M., Springer-Verlag, New York.
4. Cameron, A. and 4 others, 1987. Submitted to Mon. Not. R. astr. Soc.
5. Durney, B.R. & Robinson, R.D., 1982. Astrophys. J., 253, 290.