LI, Yi; LIU, Zhaoli; ZHAO, Cunshan. Nodal solutions of perturbed elliptic problem. Topological Methods in Nonlinear Analysis, [S. l.], v. 32, n. 1, p. 49–68, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.035. Acesso em: 4 jul. 2025.