@article{DE_1978_14_7_a4,
     author = {P. Marushiak},
     title = {Oscillation of the solutions of $n$th order differential equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1186--1191},
     publisher = {mathdoc},
     volume = {14},
     number = {7},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_7_a4/}
}