HAN, H. Sturm-Liouville Problems with Discontinuities at Two Interior Points. The Journal of the Indian Mathematical Society, [S. l.], v. 85, n. 1-2, p. 70–91, 2018. DOI: 10.18311/jims/2018/14940. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/14940. Acesso em: 4 may. 2024.