%0 Journal Article %A Munhoz, Antonio S. %A Filho, Antonio C.Souza %T Existence and analyticity of a parabolic evolution operator for nonautonomous linear equations in Banach spaces %J Electronic Journal of Differential Equations %D 2009 %V 2009 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a7/ %G en %F EJDE_2009__2009__a7