DOYLE, J.; THOMASON, R. H. Background to Qualitative Decision Theory. AI Magazine, [S. l.], v. 20, n. 2, p. 55, 1999. DOI: 10.1609/aimag.v20i2.1456. Disponível em: https://ojs.aaai.org/index.php/aimagazine/article/view/1456. Acesso em: 19 aug. 2022.