@article{DE_1997_33_10_a2,
     author = {R. G. Koplatadze and N. L. Partsvaniya},
     title = {Oscillatory properties of solutions of systems of second-order differential equations with deviating arguments},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1312--1320},
     publisher = {mathdoc},
     volume = {33},
     number = {10},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_10_a2/}
}