New Operational Matrix For Shifted Legendre Polynomials and Fractional Differential Equations With Variable Coefficients. Punjab University Journal of Mathematics, [S. l.], v. 47, n. 1, p. 79–101, 2015. Disponível em: https://pujm.pu.edu.pk/index.php/pujm/article/view/41. Acesso em: 29 jun. 2025.