Multipe solutions for a nonlocal fractional $(p,q)$-Schr\"odinger-Kirchhoff system. Nonlinear Studies, [S. l.], v. 27, n. 4, 2020. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/2048. Acesso em: 20 sep. 2025.