YANG, Z.; O’REGAN, D. Positive solutions for a $2n$th-order boundary value problem involving all derivatives of odd orders. Topological Methods in Nonlinear Analysis, [S. l.], v. 37, n. 1, p. 87–101, 2011. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2011.004. Acesso em: 25 apr. 2024.