@article{DE_1978_14_6_a21,
     author = {I. V. Kamenev},
     title = {An integral comparison and the nonoscillatory property of solutions of second order linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1136--1139},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_6_a21/}
}