سعيد علي ن. “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, vol. 8, no. 1, Mar. 2009, pp. 238-60, doi:10.33899/berj.2009.Vol8.Iss1.39212.