YURKO, V. Necessary and sufficient conditions for the solvability of the inverse problem for non-self-adjoint pencils of Sturm-Liouville operators on the half-line. Tamkang Journal of Mathematics, [S. l.], v. 42, n. 3, p. 247–258, 2011. DOI: 10.5556/j.tkjm.42.2011.742. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/742. Acesso em: 26 apr. 2024.