@article{GMJ_1999__6_3_48320,
     author = {Lomtatidze, A. and Partsvania, N.},
     title = {Oscillation and nonoscillation criteria for two-dimensional systems of first-order linear ordinary differential equations.},
     journal = {Georgian Mathematical Journal},
     pages = {285--298},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1999},
     zbl = {0930.34025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1999__6_3_48320/}
}