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"This paper deals with the existence, uniqueness and the multiplicityof solutions for a class of fractional di erential equations boundary value prob-lems involving three-point nonlocal Riemann-Liouville fractional derivative andintegral boundary conditions. Our results are based on some well-known tools of xed point theory such as Banach contraction principle,  xed point index theoryand the Leggett-Williams  xed point theorem. As applications, some examplesare presented at the end to illustrate the main results."

"A study of existence and multiplicity of positive solutions for nonlinear fractional differential equations with nonlocal boundary conditions"