Existence of infinitely many solutions to the Neumann problem for quasilinear elliptic systems involving the $\vec{p}(x)$ and $\vec{q}(x)$-Laplacian. NS [Internet]. 2017 Aug. 27 [cited 2026 Mar. 2];24(3). Available from: https://nonlinearstudies.com/index.php/nonlinear/article/view/1320