LORENZI, L. Estimates of the derivatives for a class of parabolic degenerate operators with unbounded coefficients in R^N . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 4, n. 2, p. 255-293, 2009. DOI: 10.2422/2036-2145.2005.2.03. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/68. Acesso em: 20 feb. 2026.