1. V. V. Arkhangelsky, A. V. Baskakov, Yu. E. Charikov, et al., “Observation of Solar X-ray Radiation on Board ‘Prognoz-6’,” Space Res. 19, 381–386 (1979).
2. Yu. E. Charikov, P. B. Dmitriyev, G. E. Kocharov, et al., “Storage, Structure and Processing Solar Data of X-ray Spectrometer ‘IRIS’ of Space Experiment ‘CORO-NAS-I’,” Baltic Astronomy 6, 332–333 (1997).
3. P. B. Dmitriev, I. V. Kudryavtsev, V. P. Lazutkov, et al., “Specific Features of Solar Flare X-rays Registered with the IRIS Spectrometer during the ‘CORONAS-F’ Flight,” Astron. Vestn. 40, 160–170 (2006).
4. T. J. Janssens and K. P. White, “Microwave Pulse Trains Observed before and during a Solar Flare,” Astrophys. J. 158, L127 (1969).
5. A. Klassen, H. Aurass, and G. Mann, “Sawtooth Oscillations in Solar Flare Radio Emission,” Astron. Astrophys. 370, L41–L44 (2001).