Gselmann, Ester, and Árpád Száz. “An Instructive Treatment of a Generalization of Găvruţă’s Stability Theorem”. Sarajevo Journal of Mathematics 6, no. 1 (June 11, 2024): 3–21. Accessed January 26, 2026. https://www.sjm.anubih.ba/index.php/sjm/article/view/322.