ZIENKIEWICZ, Olgierd C. Trefftz type approximation and the generalized finite element method - history and development. Computer Assisted Methods in Engineering and Science, [S. l.], v. 4, n. 3-4, p. 305–316, 2023. Disponível em: https://cames3.ippt.pan.pl/index.php/cames/article/view/1374. Acesso em: 19 apr. 2025.