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2. http://www.platekrim.com/gallery/tornado-sevastopol/index2.html , http://astronet.ru/ , http://www.osei.noaa.gov/ .
3. S.V. Alekseenko, P.A. Kuibin, and V.L. Okulov, Introduction into Theory of Concentrated Vortices [in Russian] (Novosibirsk, Kutateladze Inst. of Thermophysics, 2003).
4. M. Van Dyke, An Album of Fluid Motion (Parabolic Press, Stanford Ca., 1982).
5. H. Honji, “Vortex Motions in a Stratified Wake Flows,” Fluid. Dyn. Res. 3(1–4), 425–430 (1988).