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, june 2023. ISSN 2956-5839. Available at: <https://cames.ippt.pan.pl/index.php/cames/article/view/1394>. Date accessed: 03 july 2024.