On the Optimal Order Approximation of the Partition of Unity Finite Element Method. CSIAM Transactions on Applied Mathematics, [S. l.], v. 5, n. 2, p. 221–233, 2024. DOI: 10.4208/csiam-am.SO-2023-0022. Disponível em: https://www.global-sci.com/index.php/csiam-am/article/view/7855. Acesso em: 6 dec. 2025.