XU, J.; WEI, Z.; DING, Y. Positive solutions for a $2n$th-order $p$-Laplacian boundary value problem involving all even derivatives. Topological Methods in Nonlinear Analysis, [S. l.], v. 39, n. 1, p. 23–36, 2012. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2012.002. Acesso em: 23 apr. 2024.