JHUANG, S. C.; LIAN, W. C.; WANG, S. P.; WONG, F. H. Existence of solutions for high order ordinary differential equations with some periodic-type boundary condition. Tamkang Journal of Mathematics, [S. l.], v. 41, n. 3, p. 293–301, 2010. DOI: 10.5556/j.tkjm.41.2010.728. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/728. Acesso em: 2 may. 2024.