@article{UZMU_1950_146_146_a6,
     author = {A. D. Myshkis},
     title = {A theorem from the theory of dynamical systems},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {129--130},
     year = {1950},
     volume = {146},
     number = {146},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1950_146_146_a6/}
}