Ibadzadeh, Ch. G., and I.M. Nabiev. 2017. “Reconstruction of the Sturm – Liouville Operator With Nonseparated Boundary Conditions and a Spectral Parameter in the Boundary Condition”.
Ukrains’kyi Matematychnyi Zhurnal 69 (9): 1217-23.
https://umj.imath.kiev.ua/index.php/umj/article/view/1771.