Aslanova NM, Bairamogly M. Distribution of eigenvalues and trace formula for the Sturm–Liouville operator equation. Ukr. Mat. Zhurn. [Internet]. 2010Jul.25 [cited 2024Nov.23];62(7):867–877. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2920