@article{DE_1971_7_6_a1,
     author = {Yu. I. Domshlak},
     title = {The oscillatoriness and non-oscillatoriness of the solutions of vector differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {961--969},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a1/}
}