Meftah, B., & Souahi, A. (2019). Fractional Hermite-Hadamard type integral inequalities for functions whose modulus of the mixed derivatives are co-ordinated s-preinvex in the second sense. *Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica*, *18*, 67–83. Retrieved from https://studmath.up.krakow.pl/article/view/7942