Samraiz, M.; Afzal, M. A.; Iqbal, S.; Kashuri, A. Opial-Type Inequalities for Generalized Integral Operators With Special Kernels in Fractional Calculus. Comm. Math. Appl. 2018, 9 (3), 421-431. https://doi.org/10.26713/cma.v9i3.831.