@article{ND_2019_15_4_a18,
     author = {A. V. Sakharov},
     title = {Some {Trajectories} of a {Point} in the {Potential} of a {Fixed} {Ring} and {Center}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {587--592},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2019_15_4_a18/}
}