@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},
     year = {2009},
     volume = {2009},
     zbl = {1173.35571},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a7/}
}