MAALAOUI, A.; MARTINO, V. Existence and multiplicity results for a non-homogeneous fourth order equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 40, n. 2, p. 273–300, 2012. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2012.032. Acesso em: 26 apr. 2024.