KOŁODZIEJ, Jan A.; STAROSTA, Roman. Self-adaptive Trefftz procedure for harmonic problems. Computer Assisted Methods in Engineering and Science, [S. l.], v. 4, n. 3-4, p. 491–500, 2023. Disponível em: https://cames3.ippt.pan.pl/index.php/cames/article/view/1385. Acesso em: 12 jan. 2025.