1. Bertaux, J.L., Lallement, R., Kurt, V.G., Mironova, E.N., 1985, Astronomy and Astrophysics, 150, 1.
2. Bloch, J.J., Jahoda, K., Juda, M., McCammon, D., Sanders, W.T., Snowden, S.L., Zhang, J., 1986, Astrophysical Journal, Letters to the Editor, 308, 59.
3. Bowyer, C.S., Field, G.B., Mack, J.E., 1968, NATURE, 217, 32.
4. Bregman, J.N., Pildis, R.A., 1994, Astrophysical Journal, 420, 570.
5. Breitschwerdt, D., 1994, Habilitationsschrift, Universit�t Heidelberg, 158p.