Fallah, K., & Rasouli, S. H. (2017). The Nehari manifold approach for a $p(x)$ -Laplacian problem with nonlinear boundary conditions. Ukrains’kyi Matematychnyi Zhurnal, 69(1), 92-103. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/1678