I. Albayrak, E. Adigüzelov, and M. Bayramoğlu, “The second regularized trace formula for the Sturm-Liouville problem with spectral parameter in a boundary condition”, MFAT, vol. 6, no. 3, pp. 1–8, Sep. 2000, Accessed: Dec. 17, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/122