PORTER, T. Abstract Homotopy Theory: The Interaction of Category Theory and Homotopy Theory. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 1, p. 113–163, 2003. Disponível em: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1711. Acesso em: 29 apr. 2024.