Existence and Nonuniqueness of Solutions to a Robin Boundary Problem for Semilinear Elliptic Equations. Journal of Partial Differential Equations, [S. l.], v. 8, n. 4, p. 289–296, 2020. Disponível em: https://global-sci.com/index.php/jpde/article/view/3804. Acesso em: 26 feb. 2026.