TY - JOUR AU - Debbouche, Amar AU - El-Borai, Mahmoud M. TI - Weak almost periodic and optimal mild solutions of fractional evolution equations JO - Electronic journal of differential equations PY - 2009 VL - 2009 UR - http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a44/ LA - en ID - EJDE_2009__2009__a44 ER -