ONNINEN, J.; ZHONG, X. Continuity of solutions of linear, degenerate elliptic equations. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 6, n. 1, p. 103-116, 2009. DOI: 10.2422/2036-2145.2007.1.06. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/118. Acesso em: 27 may. 2025.