1. Becker, U.: 1958, Z. f. Astrophys. 44, pp. 243–248.
2. Brueckner, G, E.: 1972, “Conference on Flare-Produced Shock Waves…”, HAO/NCAR, Boulder, Sept. 11–14.
3. Bruzek, A.: 1951, Z.f. Astrophys. 28, pp. 277–295.
4. Bruzek, A.: 1964, Astrophys. J. 140, pp. 746.
5. Bruzek, A.: 1969, “Solar Flares and Space Research”,ed. C. de Jager and Z. Svestka, pp. 61.