@article{PORMA_1997__54_3_47812,
     author = {Yan, Jurang},
     title = {Comparison results for impulsive delay differential inequalities and equations.},
     journal = {Portugaliae mathematica},
     pages = {255--261},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1997},
     zbl = {0882.34071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1997__54_3_47812/}
}