An Optimal Sixth-Order Finite Difference Scheme for the Helmholtz Equation in One-Dimension. Communications in Mathematical Research, [S. l.], v. 35, n. 3, p. 264–272, 2019. DOI: 10.13447/j.1674-5647.2019.03.07. Disponível em: https://global-sci.com/index.php/cmr/article/view/9007. Acesso em: 5 dec. 2025.