1. Carbonel, M., Oliver, L., and Ballester, J.L., A search for chaotic behavior in solar activity, Astron. Astrophys., 1994, vol. 290, no. 3, pp. 983–994.
2. Mikhailutsa, V.P. and Fat’yanov, M.P., Dimension and structure of the solar attractor based on the energy of the solar magnetic field in cycle 21, Soln. Dannye, 1989, no. 11, pp. 109–116.
3. Kozlov, V.I., Scale invariance of cosmic ray fluctuation dynamics at the geoeffective phases of the solar cycle, Geomagn. Aeron., 1999a, vol. 39, no. 1, pp. 95–99.
4. Kozlov, V.I., Estimation of the scaling properties of the dynamics of cosmic ray fluctuations in the solar activity cycle, Geomagn. Aeron., 1999b, vol. 39, no. 1, pp. 100–104.
5. Potapov, A.A., Fraktaly v radiofizike i radiolokatsii (Fractals in Radio Physics and Radar Ranging), Moscow: LOGOS, 2005.