1. A.A. Kilbas, H.M. Srivastava, J.J. Trujillo, Theory and Applications of Fractional Differential Equations, in North-Holland Mathematical Studies, Vol. 204 (Elsevier, 2006)
2. I. Podlubny, Fractional Differential Equations: An introduction to fractional derivatives, fractional differential equations, to methods of their solution and some of their applications (Academic Press, New York, 1999)
3. D. Baleanu, K. Diethelm, E. Scalas, J.J. Trujillo, Fractional Calculus: Models and Numerical Methods, in Series on Complexity, Nonlinearity and Chaos, Vol. 3 (World Scientific Publishing Company, Singapore, New Jersey, London and Hong Kong, 2012)
4. R. Khalil, M. Al Horani, A. Yousef, M. Sababheh, J. Comput. Appl. Math. 264, 65 (2014)
5. J. Singh, Devendra Kumar, A. Klman, Abstr. Appl. Anal. 2013, 934060 (2013)