JÓDAR, LUCAS; ALMENAR, PEDRO. Analytic-numerical solution with a priori error bounds for lateral vibrations of a string with variable tension and mass density. Utilitas Mathematica , [S. l.], v. 55, 1999. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/140. Acesso em: 8 may. 2026.