@article{EJDE_2009__2009__a44,
     author = {Debbouche,  Amar and El-Borai,  Mahmoud M.},
     title = {Weak almost periodic and optimal mild solutions of fractional evolution equations},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1171.34331},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a44/}
}