D’AMBROSIO, L. Hardy-type inequalities related to degenerate elliptic differential operators. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 4, n. 3, p. 451-486, 2009. DOI: 10.2422/2036-2145.2005.3.04. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/75. Acesso em: 20 feb. 2026.