RYNNE, B. P. Infinitely many solutions of superlinear fourth order boundary value problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 19, n. 2, p. 303–312, 2002. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2002.016. Acesso em: 22 jul. 2024.