@article{EJDE_2011__2011__a25,
     author = {Liu,  Haifeng and Li,  Qiaoluan},
     title = {Asymptotic behavior of second-order impulsive differential equations},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1216.34074},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a25/}
}