A Comparative Study on the concentration of attention for the first-degree field referees and the assistant referees in the outdoor football fields. Journal of Pharmaceutical Negative Results, [S. l.], v. 13, n. 3, p. 183–185, 2022. DOI: 10.47750/pnr.2022.13.03.029. Disponível em: https://pnrjournal.com/index.php/home/article/view/389.. Acesso em: 5 jun. 2026.