BONDARENKO, N. . P. An inverse problem for the second-order integro-differential pencil. Tamkang Journal of Mathematics, [S. l.], v. 50, n. 3, p. 223–231, 2019. DOI: 10.5556/j.tkjm.50.2019.3348. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3348. Acesso em: 5 may. 2024.