TRELLES, Oscar. Donald Nute (ed.): Defeasible Deontic Logic. Areté, [S. l.], v. 13, n. 2, p. 183–193, 2001. DOI: 10.18800/arete.200102.008. Disponível em: https://revistas.pucp.edu.pe/index.php/arete/article/view/5621. Acesso em: 24 dic. 2025.