سعيد علي ن. (2009) “Measuring the intensity of attention after the aerobic and non-aerobic effort, the relationship between them, and the intensity recurrence period of football players”, College of Basic Education Research Journal, 8(1), pp. 238–260. Available at: https://stats.uomosul.edu.iq/index.php/berj/article/view/39212 (Accessed: 26 October 2025).