LENAT, D.; GUHA, R. V. CYC: A Midterm Report. AI Magazine, [S. l.], v. 11, n. 3, p. 32, 1990. DOI: 10.1609/aimag.v11i3.842. Disponível em: https://ojs.aaai.org/index.php/aimagazine/article/view/842. Acesso em: 29 nov. 2021.