@article{GMJ_1998__5_3_48131,
     author = {Bainov, D.D. and Dimitrova, M.B. and Petrov, V.A.},
     title = {Oscillatory properties of solutions of impulsive differential equations with several retarded arguments.},
     journal = {Georgian Mathematical Journal},
     pages = {201--212},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1998},
     zbl = {0912.34014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1998__5_3_48131/}
}