@article{VMUMM_1994_5_a12,
     author = {O. V. Aleksandrova},
     title = {On an estimate for the oscillations of persistently perturbed systems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {54--58},
     year = {1994},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1994_5_a12/}
}