J. LANGFORD, J. Symmetrization of Poisson’s equation with Neumann boundary conditions . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 14, n. 4, p. 1025-1063, 2015. DOI: 10.2422/2036-2145.201209_003. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/400. Acesso em: 13 feb. 2025.