CINGOLANI, Silvia; LAZZO, Monica. Multiple semiclassical standing waves for a class of nonlinear Schrödinger equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 10, n. 1, p. 1–13, 1997. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1997.019. Acesso em: 8 jul. 2025.