Some Properties of Free Boundary for Solution of Porous Medium Equation with Gravity Term in One-dimension. Journal of Partial Differential Equations, [S. l.], v. 4, n. 2, p. 19–35, 1991. Disponível em: https://global-sci.com/index.php/jpde/article/view/3677. Acesso em: 5 dec. 2025.