%0 Journal Article %A Anderson, Douglas R. %T Oscillation and nonoscillation criteria for two-dimensional time-scale systems of first-order nonlinear dynamic equations %J Electronic Journal of Differential Equations %D 2009 %V 2009 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a9/ %G en %F EJDE_2009__2009__a9