1. R Hilfer, Applications of Fractional Calculus in Physics, World Scientific: Singapore, 2000.
2. I. Podlubny, Fractional Differential Equations, of Mathematics in Science and Engineering, vol. 198, Academic Press, New York, NY, USA, 1999.
3. R . Hilfer, Y. Luchko, Z. Tomovski, Operational method for the solution of fractional differential equations with generalized Riemann-Liouville fractional derivatives, Fract. Calc. Appl. Anal., 2009, Vol. 12 No.3, pp. 299-318.
4. A. A. Kilbas, H. M. Srivastava, J. J. Trujillo, Theory and application of fractional differetial equations, North–Holland Mathematical Studies, Amsterdam: Elsevier, 2006.
5. S. G. Samko, A. A. Kilbas, O. I. Marichev, Fractional integrals and derivatives. Theory and applications, Gordon and Breach Science Publishers, Yveron, 1993.