Polevoy, G., H. Fuentes-Barría, and R. . Aguilera Eguia. “Effects of 32 Weeks of a Physical Program With a Ball on Physical Qualities in Russian Children Between 9 and 10 Years. Non-Randomized Quasi-Experimental Study”. Retos, vol. 52, Mar. 2024, pp. 240-5, doi:10.47197/retos.v52.101547.