%0 Journal Article %A Lomtatidze, A. %A Partsvania, N. %T Oscillation and nonoscillation criteria for two-dimensional systems of first-order linear ordinary differential equations. %J Georgian Mathematical Journal %D 1999 %P 285-298 %V 6 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/GMJ_1999__6_3_48320/ %G en %F GMJ_1999__6_3_48320