1. Goncharsky, A.V., Stepanov, V.V., Khokhlova, V.L, and Yagola, A.G. 1978, Sov. Astron. Let., 3, 147 (translated from Pis’ma Astron. Zh., 3, 278, 1977 ).
2. Goncharsky, A.V., Ryabchikova, T.A., Stepanov, V.V., Khokhlova, V.L., and Yagola, A.G. 1983, Sov. Astron., 27, 49 (translated from Astron. Zh., 60, 83, 1983 ).
3. Jankov, S., and Foing, B. 1987, in Proc. Fifth Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, eds. J.L. Linsky and R.E. Stencel, ( Springer-Verlag: Berlin ), p. 528.
4. Khokhlova, V.L. 1976, Sov. Astron., 19, 576 (translated from Astron. Zh., 52, 950, 1975).
5. Lestrade, J.-F., Mutel, R.L., Preston, R.A., and Phillips, R.B. 1985, in Radio Stars, eds. R.N., Hjellming and D.M. Gibson, ( Reidel: Dordrecht ), p. 275.