MARTINS, A. P. Union oligopoly and entry in the presence of homogeneous labor. Journal of Economics and Political Economy, [S. l.], v. 7, n. 1, p. 47–74, 2020. Disponível em: https://journals.econsciences.com/index.php/JEPE/article/view/2027. Acesso em: 24 feb. 2026.