%0 Journal Article %A G. V. Gorr %A D. N. Tkachenko %A E. K. Shchetinina %T Research on the Motion of a Body in a Potential Force Field in the Case of Three Invariant Relations %J Russian journal of nonlinear dynamics %D 2019 %P 327-342 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2019_15_3_a9/ %G ru %F ND_2019_15_3_a9