Trujillo Chávez, Hugo Santiago, Jorge Giovanny Tocto Lobato, Orlando David, and Olguer Fabián Sánchez Espinoza. “Concentration Routines in Intermediate Level Tennis Players”. Ciencia Digital 4, no. 1 (January 4, 2020): 224-235. Accessed August 24, 2024. https://cienciadigital.org/revistacienciadigital2/index.php/CienciaDigital/article/view/1096.