@article{SM_1967_2_4_a4,
     author = {V. K. Mel'nikov},
     title = {On the behavior of the trajectories of a class of dynamical systems},
     journal = {Sbornik. Mathematics},
     pages = {477--500},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_2_4_a4/}
}