KALININ, Răzvan, Robert BALAZSI, and Iacob HANŢIU. “OPTIMIZING SPORTS PERFORMANCE THROUGH MENTAL TOUGHNESS: PILOT STUDY”. Studia Universitatis Babeş-Bolyai Educatio Artis Gymnasticae 65, no. 2 (June 30, 2020): 69–80. Accessed May 9, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbeducatio/article/view/1391.