ISMAIL, A. F. H. Class Representation of Shapes Using Qualitative-codes. Acta Polytechnica, [S. l.], v. 41, n. 3, 2001. DOI: 10.14311/224. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/224. Acesso em: 6 may. 2024.