A Kernel-Free Boundary Integral Method for Variable Coefficients Elliptic PDEs. Communications in Computational Physics, [S. l.], v. 15, n. 4, p. 1108–1140, 2020. DOI: 10.4208/cicp.170313.071113s. Disponível em: https://gsp.tricubic.dev/cicp/article/view/6193. Acesso em: 15 mar. 2026.