Hermite-Hadamard and Hermite-Hadamard-Fej\'er type Inequalities for   Generalized Fractional Integrals
  In this paper we obtain the Hermite-Hadamard and Hermite-Hadamard-Fej\'er type inequalities for fractional integrals which generalize the two familiar fractional integrals namely, the Riemann-Liouville and the Hadamard fractional integrals into a single form. We prove that, in most cases, we obtain the Riemann--Liouville and the Hadamard equivalence just by taking limits when a parameter $\rho \rightarrow 1$ and $\rho \rightarrow 0^+$, respectively. 
Hua Chen, Udita N. Katugampola
math.CA