Farid, Ghulam, Kristina Krulić, and Josip Pečarić. “On a Refinement of Hardy’s Inequalities via Superquadratic And Subquadratic Functions”. Sarajevo Journal of Mathematics 7, no. 2 (June 10, 2024): 163–175. Accessed January 26, 2026. https://www.sjm.anubih.ba/index.php/sjm/article/view/287.