1. Agrawal, P.C., Rao, A.R. and Sreekantan, B.V.: 1986, Montly Not. Roy. Astron. Soc. 219, 225.
2. Byrne, P.B.: 1989, Solar Phys. 121, 61.
3. Byrne, P.B.: 1983, in Activity in Red-dwarf Stars (P.B. Byrne and M. Rodonò eds.), p. 157.
4. Byrne, P.B. and Rodonò, M. (eds.): 1983, Activity in Red-dwarf Stars, Reidel Publ. Co., Dordrecht.
5. Bromage, G.E., Phillips, K.J.H., Dufton, P.L. and Kingston, A.E.: 1986, Montly Not. Roy Astron. Soc. 220, 1021.