JASIM, Anmar Hashim. Studying the solutions of the delay Sturm Liouville problems. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 842–849, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7286. Acesso em: 6 nov. 2026.