@article{DAN_1963_148_2_a11,
     author = {Yu. I. Neimark},
     title = {The relation between small changes in a system of differential equations and the corresponding point mapping},
     journal = {Doklady Akademii Nauk},
     pages = {281--283},
     publisher = {mathdoc},
     volume = {148},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a11/}
}