“Indicators of Selection in the Middle Fund and Fund Athletes of Eide Pedro Batista Fonseca Category 12 - 13 and 14 - 15 Years of the Province of Granma (Original)”. Revista científica Olimpia, vol. 14, no. 45, July 2019, pp. 152-65, https://revistas.udg.co.cu/index.php/olimpia/article/view/845.