SPURI, J.; CHAVES, L. M. . AN ELEMENTARY DEMONSTRATION OF THE FRIENDSHIP THEOREM USING GRAPHS WITH AN APPLICATION IN EXPERIMENTAL DESIGNS. Brazilian Journal of Biometrics, [S. l.], v. 40, n. 3, 2022. DOI: 10.28951/bjb.v40i3.586. Disponível em: https://biometria.ufla.br/index.php/BBJ/article/view/586. Acesso em: 7 feb. 2023.