%0 Journal Article %A A. V. Borisov %A I. S. Mamaev %T On isomorphisms of some integrable systems on a plane and a sphere %J Russian journal of nonlinear dynamics %D 2007 %P 49-56 %V 3 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2007_3_1_a2/ %G ru %F ND_2007_3_1_a2