Aharrouch, Benali, Mohamed Boukhrij, and Jaouad Bennouna. 2018. “Existence of Solutions for a Class of Degenerate Elliptic Equations in $P(x)$-Sobolev Spaces”. Topological Methods in Nonlinear Analysis 51 (2):389-411. https://apcz.umk.pl/TMNA/article/view/TMNA.2017.065.