de Freitas, J.A. Teixeira, and L.M.S. Santos Castro. “Finite Element Solutions With Walsh Series and Wavelets”. Computer Assisted Methods in Engineering and Science 4, no. 1 (March 31, 1997): 127–155. Accessed March 5, 2026. https://cames.ippt.gov.pl/index.php/cames/article/view/1417.