@article{DE_1986_22_3_a2,
     author = {G. T. Gegelia},
     title = {On bounded and periodic solutions of even-order nonlinear ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {390--396},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_3_a2/}
}