@article{DE_1997_33_5_a1,
     author = {V. V. Basov and Yu. N. Bibikov},
     title = {On the stability of the equilibrium state in a case of periodic perturbation of the center},
     journal = {Differencialʹnye uravneni\^a},
     pages = {583--586},
     publisher = {mathdoc},
     volume = {33},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_5_a1/}
}