Thanoun B, Younes R, Ali S. A comparative study in the vertical work done and the ball launch angle between the Float and crushing services of jumping in volleyball. RJSS [Internet]. 2022 Aug. 1 [cited 2025 Oct. 2];25(77):180-95. Available from: https://rsprs.uomosul.edu.iq/index.php/rsprs/article/view/50762