WETH, Tobias. Nodal solutions to superlinear biharmonic equations via decomposition in dual cones. Topological Methods in Nonlinear Analysis, [S. l.], v. 28, n. 1, p. 33–52, 2006. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2006.018. Acesso em: 18 feb. 2025.