%0 Journal Article %T Existence of Solutions for Integrodifferential Equations of Fractional Order with Antiperiodic Boundary Conditions %A Ahmed Alsaedi %J International Journal of Differential Equations %D 2009 %I Hindawi Publishing Corporation %R 10.1155/2009/417606 %X We discuss the existence of solutions for a nonlinear antiperiodic boundary value problem of integrodifferential equations of fractional order กส(1,2]. The contraction mapping principle and Krasnoselskii's fixed point theorem are applied to establish the results. %U http://www.hindawi.com/journals/ijde/2009/417606/