@article{01171996, title = {Oscillatory properties of solutions of impulsive differential equations with several retarded arguments.}, journal = {Georgian Mathematical Journal}, volume = {5}, year = {1998}, pages = {201-212}, doi = {10.1023/B:GEOR.0000008120.87888.83}, zbl = {0912.34014}, language = {en}, url = {http://dml.mathdoc.fr/item/01171996} }
Bainov, D.D.; Dimitrova, M.B.; Petrov, V.A. Oscillatory properties of solutions of impulsive differential equations with several retarded arguments.. Georgian Mathematical Journal, Tome 5 (1998) pp. 201-212. doi : 10.1023/B:GEOR.0000008120.87888.83. http://gdmltest.u-ga.fr/item/01171996/