@article{10_4064_ap100_1_8,
     author = {Jianwen Zhou and Yongkun Li},
     title = {Existence and multiplicity of solutions for
a class of damped vibration problems with impulsive effects},
     journal = {Annales Polonici Mathematici},
     pages = {87--98},
     publisher = {mathdoc},
     volume = {100},
     number = {1},
     year = {2011},
     doi = {10.4064/ap100-1-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap100-1-8/}
}