%0 Journal Article %A L. G. Kurakin %A I. V. Ostrovskaya %T The stability criterion of a regular vortex pentagon outside a circle %J Russian journal of nonlinear dynamics %D 2012 %P 355-368 %V 8 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2012_8_2_a9/ %G ru %F ND_2012_8_2_a9