Efficient spectral Legendre Galerkin approach for the advection diffusion equation with constant and variable coefficients under mixed Robin boundary conditions . Advances in the Theory of Nonlinear Analysis and its Application, [S. l.], v. 7, n. 1, p. 133–147, 2023. Disponível em: https://atnaea.org/index.php/journal/article/view/24.. Acesso em: 2 jun. 2026.