@article{DAN_1972_202_3_a9,
     author = {N. Kh. Rozov},
     title = {The local section method for systems with refraction of trajectories},
     journal = {Doklady Akademii Nauk},
     pages = {535--538},
     publisher = {mathdoc},
     volume = {202},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_3_a9/}
}