COHN, P. M. The Weyl algebra and its field of fractions. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 2, p. 231–238, 2003. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1697. Acesso em: 19 may. 2024.