1. S. I. Vainshtein, Magnetic Fields in Space (Nauka, Moscow, 1983) [in Russian].
2. S. I. Vainshtein, Ya. B. Zel’dovich, and A. A. Ruzmaikin, Turbulent Dynamo in Astrophysics (Nauka, Moscow, 1980) [in Russian].
3. R. Bray and R. Loughhead, Sunspots (Chapman Hall, London, 1964; Mir, Moscow, 1967).
4. S. D. Ivanov and V. P. Maksimov, “On Decay of Sunspots,” Pis’ma Astron. Zh. 4, 232–234 (1978).
5. Ya. B. Zel’dovich, “Magnetic Field at Two-Dimensional Motion of Conducting Liquid,” Zh. Eksp. Teor. Fiz. 31, 154–156 (1956).