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Meftah, B. and 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, (May 2019), 67–83.