LIU, Weiming; NIU, Miaomiao. Multiple positive solutions for the nonlinear Schrödinger–Poisson system. Annales Fennici Mathematici, [S. l.], v. 42, n. 1, p. 285–302, 2017. DOI: 10.5186/aasfm.2017.4218. Disponível em: https://afm.journal.fi/article/view/135662. Acesso em: 11 apr. 2026.