%0 Journal Article %A Dai, Jinchun %A Li, Yongkun %A Zhang, Tianwei %T Positive periodic solutions for nonautonomous impulsive neutral functional differential systems with time-varying delays on time scales %J Electronic Journal of Differential Equations %D 2010 %V 2010 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a9/ %G en %F EJDE_2010__2010__a9