@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/