BUTERIN, S. An inverse spectral problem for Sturm-Liouville-type integro-differential operators with robin boundary conditions. Tamkang Journal of Mathematics, [S. l.], v. 50, n. 3, p. 207–221, 2019. DOI: 10.5556/j.tkjm.50.2019.3347. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3347. Acesso em: 4 dec. 2024.