1. V. M. Grechnev, S. V. Kuzin, A. M. Urnov, et al., Solar Syst. Res. 40, 286 (2006).
2. A. T. Altyntzev, V. V. Grechnev, H. Nakajima, et al., Astron. Astrophys. 113, 415 (1999).
3. L. K. Harra-Murnion, B. Schmieder, L. van Driel-Gesztelyi, et al., Astron. Astrophys. 337, 911 (1998).
4. S. Kamio, H. Kurokawa, and T. Ishi, Solar Phys. 215, 127 (2003).
5. K. Ichimoto and T. Sakurai, The Flare Telescope and Norikura Team, in Proceedings of the 2nd Japan-China Seminar on Solar Physics, Ed. by T. Sakurai, T. Hirayama, and G. Ai (NAO, Tokyo, 1994), p. 151.