AUDOUX, Benjamin; BOBKOV, Vladimir; PARINI, Enea. On multiplicity of eigenvalues and symmetry of eigenfunctions of the $p$-Laplacian. Topological Methods in Nonlinear Analysis, [S. l.], v. 51, n. 2, p. 565–582, 2018. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.055. Acesso em: 8 jul. 2025.