Team, S. “On Some Cebyˇsev Type Inequalities for ˇ Functions Whose Second Derivatives Are R-Convex on the Co-Ordinates: B. Meftah, Khaled Boukerrioua, T. Chiheb”. Thai Journal of Mathematics, vol. 16, no. 2, Aug. 2018, pp. 371-82, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/800.