Lorenzzetti, G.S., J.P. Zingano, and P.R. Zingano. “Error Analysis on General Grids for Finite Difference Discretizations of Sturm-Liouville Problems”. Trends in Computational and Applied Mathematics 9, no. 1 (June 1, 2008): 115–124. Accessed July 3, 2024. https://tcam.sbmac.org.br/tema/article/view/186.