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Naktal Muzahem Khaleel, Songol Bilal Murad, Wissam Mahdi Saleh. USING VARIABLE RATIOS IN PERIODS OF WORK TO REST AND ITS REFLECTION TO DEVELOPING SOME PHYSICAL VARIABLES FOR HANDBALL PRACTITIONERS AGED 40-50 YEARS. Res. Jou. Ana.Inv. [Internet]. 2022 Jun. 5 [cited 2024 Nov. 18];3(06):1-12. Available from: https://reserchjet.academiascience.org/index.php/rjai/article/view/509