FALLAH, K.; RASOULI, S. H. The Nehari manifold approach for a $p(x)$ -Laplacian problem with nonlinear boundary conditions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 1, p. 92–103, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1678. Acesso em: 5 dec. 2025.