1. Podlubny, I.: Fractional Differential Equations. Academic Press, New York (1993)
2. Miller, K.S., Ross, B.: An Introduction to the Fractional Calculus and Differential Equations. Wiley, New York (1993)
3. Kilbas, A.A., Srivastava, H.M., Trujillo, J.J.: Theory and Applications of Fractional Differential Equations. Elsevier, Amsterdan (2006)
4. Lakshmikantham, V., Leela, S., Vasundhara Devi, J.: Theory of Fractional Dynamic Systems. Cambridge Scientific Publishers, Cambridge (2009)
5. Diethelm, K.: The Analysis of Fractional Differential Equations. Springer, Heidelberg (2010)