REUTSKIY, Sergiy; TIROZZI, Brunello. Trefftz spectral method for elliptic equations of general type. Computer Assisted Methods in Engineering and Science, [S. l.], v. 8, n. 4, p. 629–644, 2023. Disponível em: https://cames3.ippt.pan.pl/index.php/cames/article/view/1164. Acesso em: 19 apr. 2025.