PANAKHOV, E. S.; YILMAZER, R. On inverse problem for singular Sturm-Liouville operator from two spectra. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 1, p. 132–138, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3440. Acesso em: 5 dec. 2025.