1. Allen, C.W.: 1973, Astrophysical Quantities, Athlone Press, London.
2. Andrews, A.D.: 1969, IBVS, No.326.
3. Bookbinder, J., Walter, F., Brown, A.: 1992, Cool Stars, Stellar Systems and the Sun, J. Bookbinder & M. Giampapa, ASP Conf. Series, p. 27.
4. Bromage, G.E., Phillips, K.J.H., Dufton, P.L., Kingston, A.E.: 1986, MNRAS 220, 1201.
5. Bruner, M.E., McWhirter, R.W.P.: 1988, ApJ 326, 1002.