DURFEE, E. H. Practically Coordinating. AI Magazine, [S. l.], v. 20, n. 1, p. 99, 1999. DOI: 10.1609/aimag.v20i1.1443. Disponível em: https://ojs.aaai.org/index.php/aimagazine/article/view/1443. Acesso em: 2 dec. 2020.