Geodesic
The problem of lift maximization for circle with a~vortex in a~stream
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 32-34

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The key part of the problem lies in finding of vortex position in a stream which would provide the maximum lift of circle. It has been shown that at approaching of a vortex to circle the lift unrestrictedly increases. 
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E. V. Varsegova. The problem of lift maximization for circle with a~vortex in a~stream. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 32-34. http://geodesic.mathdoc.fr/item/ISU_2010_10_1_a5/