MELENK, J. M.; BABUŠKA, I. Approximation with harmonic and generalized harmonic polynomials in the partition of unity method. Computer Assisted Methods in Engineering and Science, [S. l.], v. 4, n. 3-4, p. 607–632, 2023. Disponível em: https://cames3.ippt.pan.pl/index.php/cames/article/view/1394. Acesso em: 12 jan. 2025.