@article{DE_1980_16_8_a21,
     author = {Ch. A. Skhalyaho},
     title = {On the oscillatory and nonoscillatory natures of the solutions for a system of nonlinear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1523--1526},
     publisher = {mathdoc},
     volume = {16},
     number = {8},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_8_a21/}
}