PETER GUMM, H. State based systems are coalgebras. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 2, p. 239–262, 2003. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1698. Acesso em: 18 may. 2024.