1. Antonucci, E., Gabriel, A. H., Acton, L. W., Culhane, J. L., Doyle, J. G., Leibacher, J. W., Machado, M. E., Orwig, L. E., and Rapley, C. G.: 1982,Solar Phys. 78, 107.
2. Antonucci, E., Rosner, R., and Tsinganos, K.: 1986,Astrophys. J. 301, 975.
3. Barr, P.et al. 1988,The High-Throughput X-Ray Spectroscopy Mission: The Mission Science Report, ESA SP-1097.
4. Brinkman, A. C., van Rooijen, J. J., Bleeker, J. A. M., Dijkstra, J. H., Heise, J., de Korte, P. A. J., Mewe, R., and Paerels, F.: 1987,Astrophys. Letters Comm. 26, 73.
5. Fludra, A. and Sylwester, J.: 1986,Solar Phys. 105, 323.