LEVI, Isaac. Obligation and permission when there is a second best and when there is a second worst. Análisis Filosófico, [S. l.], v. 26, n. 2, p. 356–372, 2006. Disponível em: https://analisisfilosofico.org/index.php/af/article/view/190. Acesso em: 15 sep. 2026.