NIZHNIK, L. Inverse spectral nonlocal problem for the first order ordinary differential equation. Tamkang Journal of Mathematics, [S. l.], v. 42, n. 3, p. 385–394, 2011. DOI: 10.5556/j.tkjm.42.2011.881. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/881. Acesso em: 2 may. 2024.