FURTADO, M. F. Nodal solutions for a nonhomogeneous elliptic equation with symmetry. Topological Methods in Nonlinear Analysis, [S. l.], v. 29, n. 1, p. 69–78, 2007. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2007.004. Acesso em: 25 mar. 2023.