Youssef Abdel Amir Darwish, Muhammad Rafid Mahdi, Adel Abbas Dhiab. The Effect of fixed and variable method using Adidas Smart Ball in improving the accuracy of the direct free kick score for football. Mustansiriyah J. Sports Sc. [Internet]. 2024 Feb. 12 [cited 2025 Apr. 19];1(4):130-7. Available from: https://mjss.uomustansiriyah.edu.iq/index.php/mjss/article/view/555