CLEMENTE, F. M., and F. M. L. MARTINS. “Who Are The Prominent Players in the UEFA Champions League? An Approach Based on Network Analysis”. Walailak Journal of Science and Technology (WJST), vol. 14, no. 8, May 2017, pp. 627-36, https://wjst.wu.ac.th/index.php/wjst/article/view/3416.