سايح ع. ا., زياني ز., & كمال ب. ا. (2024). The effect of physical effort according to energy sources on the development of some physical attributes (speed - endurance of speed) according to the playing centers in U17 football. Journal of Sport Science Technology and Physical Activities, 21(1), 221–231. https://doi.org/10.5281/zenodo.15191773