1. Fractional Differential Equations;Podlubny,1999
2. Theory and Applications of Fractional Differential Equations;Kilbas,2006
3. The Sturm–Liouville problem for a second order ordinary differential equation with fractional derivatives in the lower terms;Nakhushev;Dokl. Akad. Nauk SSSR,1977
4. The Sturm–Liouville problem for a second order ordinary differential equation with fractional derivatives in the lower terms;Aleroev;Differ. Uravneniya,1982
5. Existence of solution for a boundary value problem of fractional order;Zhang;Acta Math. Sci.,2006