Kılınç, S., A. Akkurt, and H. Yıldırım. “On Hermite-Hadamard Type Inequalities for S-Phi_preinvex Functions by Using Riemann-Liouville Fractional Integrals”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA), vol. 9, no. 2, July 2019, pp. 253-60, doi:10.11121/ijocta.01.2019.00549.