LAASONEN, P. On the discretizations error of the Dirichlet problem in a plane region with corners. Annales Fennici Mathematici, [S. l.], n. 408, 1967. DOI: 10.5186/aasfm.1967.408. Disponível em: https://afm.journal.fi/article/view/134084. Acesso em: 26 nov. 2024.