1. Theory and Applications of Fractional Differential Equations;Kilbas,2006
2. Fractional Differential Equations, Mathematics in Science and Engineering;Podlubny,1999
3. Fractional Integrals and Derivatives. Theory and Applications;Samko,1993
4. Theory of Fractional Dynamic Systems;Lakshmikantham,2009
5. Existence of positive solutions of nonlinear fractional differential equations;Babakhani;J. Math. Anal. Appl.,2003