AVDONIN, S. A.; BELINSKIY, B. P.; MATTHEWS, J. V. Inverse problem on the semi-axis: local approach. Tamkang Journal of Mathematics, [S. l.], v. 42, n. 3, p. 275–293, 2011. DOI: 10.5556/j.tkjm.42.2011.916. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/916. Acesso em: 4 may. 2024.