@article{GMJ_1999__6_4_48312,
     author = {Koplatadze, R. and Partsvania, N.},
     title = {Oscillatory behaviour of solutions of two-dimensional differential systems with deviated arguments.},
     journal = {Georgian Mathematical Journal},
     pages = {335--346},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1999},
     zbl = {0928.34048},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1999__6_4_48312/}
}