1. Bazilevskaya G.A., Svirzhevskaya A.K., Sladkova A.I. Relation between solar proton events and X flares of different classes. Geomagnetism and Aeronomy. 2004, vol. 44, no. 4, pp. 404–409., Bazilevskaya G.A., Svirzhevskaya A.K., Sladkova A.I. Relation between solar proton events and X flares of different classes. Geomagnetism and Aeronomy. 2004, vol. 44, no. 4, pp. 404–409.
2. Belov A.V., Eroshenko E.A., Vashenyuk E.V., Pchelkin V.V. Cosmic-ray intensity enhancement and structure of the 1998 May 2 solar wind disturbance. Solar System Res. 2000, vol. 34, no. 2, pp. 154–157., Belov A.V., Eroshenko E.A., Vashenyuk E.V., Pchelkin V.V. Cosmic-ray intensity enhancement and structure of the 1998 May 2 solar wind disturbance. Solar System Res. 2000, vol. 34, no. 2, pp. 154–157.
3. Belov A.V., Eroshenko E.A., Kryakunova O.N., Kurt V.G., Yanke V.G. Ground Level Enhancements of solar cosmic rays during the last three solar cycles. Geomagnetism and Aeronomy. 2010, vol. 50, no. 1, pp. 21–33., Belov A.V., Eroshenko E.A., Kryakunova O.N., Kurt V.G., Yanke V.G. Ground Level Enhancements of solar cosmic rays during the last three solar cycles. Geomagnetism and Aeronomy. 2010, vol. 50, no. 1, pp. 21–33.
4. Belov A., Garcia H., Kurt V., Mavromichalaki H., Gerontidou M. Proton enhancements and their relation to the X-ray flares during the three last solar cycles. Solar Phys. 2005, vol. 229, pp. 135–159. DOI: 10.1007/s11207-005-4721-3., Belov A., Garcia H., Kurt V., Mavromichalaki H., Gerontidou M. Proton enhancements and their relation to the X-ray flares during the three last solar cycles. Solar Phys. 2005, vol. 229, pp. 135–159. DOI: 10.1007/s11207-005-4721-3.
5. Cliver E.W. The Unusual Relativistic Solar Proton Events of 1979 August 21 and 1981 May 10. Astrophys. J. 2006, vol. 639, no. 2, pp. 1206–1217. DOI: 10.1086/499765., Cliver E.W. The Unusual Relativistic Solar Proton Events of 1979 August 21 and 1981 May 10. Astrophys. J. 2006, vol. 639, no. 2, pp. 1206–1217. DOI: 10.1086/499765.