Ahmed Iesa, Adnan, and Nawfal Fathel Rasheed. “The Effect of Interference of Fixed and Variable Practice Schedules on the Art of Skill Performance of Some Basic Handball Skills”. Al-Rafidain Journal For Sport Sciences 27, no. 85 (October 1, 2024): 1209–1224. Accessed October 2, 2025. https://rsprs.uomosul.edu.iq/index.php/rsprs/article/view/50533.