@article{EJDE_2005__2005__a67,
     author = {Liu,  Qiming and Dong,  Shijie},
     title = {Periodic solutions for a delayed predator-prey system with dispersal and impulses},
     journal = {Electronic journal of differential equations},
     year = {2005},
     volume = {2005},
     zbl = {1075.34066},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a67/}
}