@article{SM_2020_211_1_a1,
     author = {V. V. Kozlov},
     title = {First integrals and asymptotic trajectories},
     journal = {Sbornik. Mathematics},
     pages = {29--54},
     publisher = {mathdoc},
     volume = {211},
     number = {1},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_1_a1/}
}