Existence of infinitely many solutions to the Neumann problem for quasilinear elliptic systems involving the $\vec{p}(x)$ and $\vec{q}(x)$-Laplacian. Nonlinear Studies, [S. l.], v. 24, n. 3, 2017. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/1320. Acesso em: 2 mar. 2026.