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2. V. V. Yanovsky, Universitates, No. 3 (2003).
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4. M. Schroeder, Fractals, Chaos, and Power Laws: Minutes from an Infinite Paradise (Freeman, New York, 1991; Regular. Khaotich. Dinamika, Izhevsk, 2005).
5. A. N. Bogolyubov, A. A. Petukhov, and N. E. Shapkina, Vestn. Mosk. Univ., Fiz. Astron, No. 2, 7 (2008).