@article{ND_2012_8_2_a9,
     author = {L. G. Kurakin and I. V. Ostrovskaya},
     title = {The stability criterion of a regular vortex pentagon outside a circle},
     journal = {Russian journal of nonlinear dynamics},
     pages = {355--368},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2012_8_2_a9/}
}