@article{EJDE_2007__2007__a79,
     author = {Zhuang,  Kejun},
     title = {Periodic solutions for a stage-structure ecological model on time scales},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1133.92357},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a79/}
}