High Order Compact Finite Difference Schemes for the Helmholtz Equation with Discontinuous Coefficients. Journal of Computational Mathematics, [S. l.], v. 29, n. 3, p. 324–340, 2018. DOI: 10.4208/jcm.1010-m3204. Disponível em: https://global-sci.com/index.php/JCM/article/view/12038. Acesso em: 6 dec. 2025.