Pečarić, Josip, and Ksenija Smoljak Kalamir. “GAUSS-STEFFENSEN TYPE INEQUALITIES”. Matematichki Bilten 38, no. 2 (January 1, 2014): 81–90. Accessed August 14, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1795.