An Effective Indirect Trefftz Method for Solving Poisson Equation in 2D. Journal of Partial Differential Equations, [S. l.], v. 30, n. 1, p. 1–10, 2018. DOI: 10.4208/jpde.v30.n1.1. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/4278. Acesso em: 5 dec. 2025.