Existence of nontrivial solutions for Schrödinger-Poisson system with sign-changing potential. Letters on Applied and Pure Mathematics, [S. l.], v. 2, n. 1, p. 42–52, 2024. DOI: 10.66147/lapm.20242126. Disponível em: https://lapmjournal.com/index.php/lapm/article/view/v2n1a26. Acesso em: 8 mar. 2026.