1. Akinyan, S.T., Fomichev, V.V., Chertok, I.M.: 1980a, In: Donnely, R.F. (ed.) Solar-Terrestrial Prediction Proceedings 3, D-14.
2. Akinyan, S.T., Fomichev, V.V., Chertok, I.M.: 1980b, Geomagn. Aeron. 20, 385 (in Russian).
3. Akinyan, S.T., Fomichev, V.V., Chertok, I.M.: 1981, Phys. Solariterr. 17, 135.
4. Andrews, M.D.: 2001, Solar Phys. 204, 181.
5. Bakshi, P., Barron, W.: 1979, J. Geophys. Res. 84, 131.