1. Theory and Applications of Fractional Differential Equations;Kilbas,2006
2. An Introduction to the Fractional Calculus and Fractional Differential Equations;Miller,1993
3. Fractional Differential Equations, Mathematics in Science and Engineering;Podlubny,1999
4. Existence of positive solutions of nonlinear fractional differential equations;Bakakhani;J. Math. Anal. Appl.,2003
5. Existence and uniqueness for a nonlinear fractional differential equation;Delbosco;J. Math. Anal. Appl.,1996