@article{DAN_1972_202_1_a8,
     author = {L. D. Pustyl'nikov},
     title = {On stability of half-trajectories under area-preserving mappings of the plane},
     journal = {Doklady Akademii Nauk},
     pages = {38--40},
     publisher = {mathdoc},
     volume = {202},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_1_a8/}
}