Abduljaleel Jabbar Nasir. The effect of shortening and lengthening round periods exercises in the development of special endurance and some pulse indicators in elite boxers. ms [Internet]. 2021 Dec. 29 [cited 2024 May 3];20(4):0042. Available from: https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/844