1. Leibnitz, G.W.: Letter from Hanover, Germany, September 30, 1695, to G. A L’Hospital, Leibnizen Mathematische Schriften, Olms, Hildesheim, Germany (1849)
2. Miller, K.S., Ross, B.: An Introduction to the Fractional Calculus and Fractional Differential Equation. Wiley, New York (1993)
3. Kibas, A.A., Anatoly, A.: Srivasfava, Theory and Applications of Fractional Differential Equations. North-Holland Mathematics Studies, vol. 204. Elsevier Science BV, Amsterdam (2006)
4. Sabatier, J., Agrawal, O.P., Machado, J.A.T. (eds.): Advances in Fractional Calculus: Theoretical Developments and Applications in Physics and Engineering. Springer, Dordrecht (2007)
5. Bai, Z., Lu, H.: Positive solutions for boundary value problem of nonlinear fractional differential equation. J. Math. Anal. Appl. 311, 495–505 (2005)