Reduction of the Appell’s System of Partial Differential Equations to the System of Total Differential Equations. Journal of Partial Differential Equations, [S. l.], v. 12, n. 4, p. 345–356, 2020. Disponível em: https://global-sci.com/index.php/jpde/article/view/3924. Acesso em: 5 dec. 2025.