@article{EJDE_2009__2009__a7,
     author = {Munhoz, Antonio S. and Filho, Antonio C.Souza},
     title = {Existence and analyticity of a parabolic evolution operator for nonautonomous linear equations in {Banach} spaces},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2009},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a7/}
}