1. E. I. Mogilevskii, B. A. Ioshpa, and V. N. Obridko, On the Force-Free Magnetic Fields in the Active Regions of the Solar Chromosphere (Space Research, Reidel Publ. Co., Amsterdam, 1964).
2. V. N. Obridko, L. B. Demkina, Yu. N. Dolginova, et al., in Proceedings of a Symposium on the Proton Flare Project, Budapest, 1968, p. 222.
3. E. E. Benevolenskaya, A. G. Kosovichev, J. R. Lemen, et al., Astrophys. J. 571, L181 (2002).
4. V. N. Obridko and B. D. Shelting, Sol. Phys. 137, 167 (1992).
5. V. N. Obridko and B. D. Shelting, Sol. Phys. 184, 187 (1999).