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 J. Math. [Internet]. 2011 Aug. 24 [cited 2024 Dec. 22];42(3):247-58. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/742