@article{EJDE_2008__2008__a74,
     author = {Tian,  Yu},
     title = {Solutions to boundary-value problems for second-order impulsive differential equations at resonance},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1139.34027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a74/}
}