@article{VMUMM_2018_2_a2,
     author = {I. F. Kobtsev},
     title = {The geodesic flow on a~two-dimensional ellipsoid in the field of an elastic force. {Topological} classification of solutions},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {27--33},
     publisher = {mathdoc},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2018_2_a2/}
}