Recurrence Relations for the Coefficients in Ultraspherical Series Solutions of Ordinary Differential Equations. Journal of Computational Mathematics, [S. l.], v. 9, n. 2, p. 171–183, 1991. Disponível em: https://global-sci.com/index.php/JCM/article/view/11026. Acesso em: 6 dec. 2025.