FRISCH, A. M.; COHN, A. G. Thoughts and Afterthoughts on the 1988 Workshop on Principles of Hybrid Reasoning. AI Magazine, [S. l.], v. 11, n. 4, p. 77, 1990. DOI: 10.1609/aimag.v11i4.876. Disponível em: https://ojs.aaai.org/index.php/aimagazine/article/view/876. Acesso em: 7 dec. 2021.