YURKO, V. An inverse spectral problem for non-selfadjoint Sturm-Liouville operators with nonseparated boundary conditions. Tamkang Journal of Mathematics, [S. l.], v. 43, n. 2, p. 289–299, 2012. DOI: 10.5556/j.tkjm.43.2012.1100. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1100. Acesso em: 19 apr. 2024.