1. Kilbas, A.A., Srivastava, H.M., Trujillo, J.J.: Theory and Applications of Fractional Differential Equations, pp. 69–79. Elsevier, Amsterdam (2006)
2. Gou, D.J., Sun, J.X., Liu, Z.L.: Functional Methods for Nonlinear Ordinary Differential Equations. pp. 219–222. Shandong Science and Technology Press (In Chinese) (2005)
3. Podlubny, I.: Fractional Differential Equations. Academic Press, San Diego (1999)
4. Tian, Y.S., Bai, Z.B., Sun, S.J.: Positive solutions for a boundary value problem of fractional differential equation with p-Laplacian operator. Adv. Differ. Equ. 2019, 349 (2019)
5. Qiao, Y., Chen, F.Q., An, Y.K.: Existence and multiplicity of weak solutions for a class of fractional Sturm-Liouville boundary value problems with impulsive conditions. J. Appl. Anal. 10, 2537–2556 (2020)