@article{ND_2010_6_3_a4,
     author = {V. V. Vaskin and N. N. Erdakova},
     title = {On the dynamics of two point vortices in an annular region},
     journal = {Russian journal of nonlinear dynamics},
     pages = {531--548},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2010_6_3_a4/}
}