Periodic Solutions to Porous Media Equations of Parabolic-elliptic Type. Journal of Partial Differential Equations, [S. l.], v. 3, n. 3, p. 63–77, 1990. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3644. Acesso em: 5 dec. 2025.