Efficient and Accurate Numerical Solutions for Helmholtz Equation in Polar and Spherical Coordinates. Communications in Computational Physics, [S. l.], v. 17, n. 3, p. 779–807, 2018. DOI: 10.4208/cicp.110214.101014a. Disponível em: https://global-sci.com/index.php/cicp/article/view/7553. Acesso em: 6 dec. 2025.