1. E. I. Boltunov and I. E. Boltunov, “Separator for Cleaning of Diesel Fuels,” RF Patent No. 2199367 RU, IPC B 01 D 17/00, No. 2001111981/12, Appl.05.03.01, Publ. 02.27.03.
2. J. Batchelor, An Introduction to Fluid Dynamics (Cambridge Univ. Press, 1967).
3. D. G. Akhmetov, Vortex Rings (Izd. Geo, Novosibirsk, 2007; Springer, Berlin, 2009).
4. S. V. Alekseenko, P. A. Kuibin, and V. L. Okulov, Introduction to the Theory of Concentrated Vortices (Institute of Thermal Phys., Russian Acad. of Sci., Novosibirsk, 2003) [in Russian].
5. M. P. Escudier, “Observations of the Flow Produced in a Cylindrical Container by a Rotating Endwall,” Exp. Fluids 2(4), 189–196 (1984).