LONG, W.; PENG, S. Multiple positive solutions for a type of nonlinear Schrödinger equations. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 16, n. 2, p. 603-623, 2016. DOI: 10.2422/2036-2145.201410_007. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/459. Acesso em: 20 feb. 2026.