1. Despotashvili, M.A., Nachkebia, N.A., and Shatashvili, L.Kh., The energetic spectrum changes of Forbush effects during the different 11-year cycles of solar activity, Proc. 26th ICRC, Salt Lake City, 1999, vol. 6, pp. 419–422.
2. Dorman, L.I., Variatsii kosmicheskikh luchei (Cosmic Ray Variations), Moscow: Gostekhizdat, 1957.
3. Gerasimova, S.K., Grigoryev, V.G., Krivoshapkin, P.A., Skripin, G.V., and Starodubtsev, S.A., Variation in the Forbush-decrease rigidity spectrum with the cycles of solar activity, Sol. Syst. Res., 2000, vol. 34, no. 3, pp. 262–264.
4. Grigoryev, V.G. and Starodubtsev, S.A., Temporal Changes in the Energy Spectrum of Forbush Decreases in 20–23 Solar Activity Cycles, Bull. Russ. Acad. Sci.: Phys., 2011, vol. 75, no. 6, pp. 801–804.
5. Grigoryev, V.G., Starodubtsev, S.A., Krymsky, G.F., Krivoshapkin, P.A., Timofeev, V.E., Prikhodko, A.N., and Karmadonov, A.Ya., Modern Yakutsk cosmic ray spectrograph after A.I. Kuzmin, Proc. 32nd ICRC, Bejing, 2011, vol. 11, p. 257–260.