%0 Journal Article %A Zhuang, Kejun %T Periodic solutions for a stage-structure ecological model on time scales %J Electronic Journal of Differential Equations %D 2007 %V 2007 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a279/ %G en %F EJDE_2007__2007__a279