FATIMA HASAN HASSOUN; MUNTADHAR MAJEED ALI; ABDUL-SATTAR JABBAR AL-DHAMAD. The effect of mental exercises and tennis tools in the development of concentration and intensity of attention according to the Vienna psychological system and front and rear impact. Modern Sport, [S. l.], v. 18, n. 1, p. 333–342, 2019. Disponível em: https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/1441. Acesso em: 2 apr. 2025.