Zhumanova, L. K., and M. A. Sadybekov. 2018. “The First Regularized Trace of Integro-Differential Sturm-Liouville Operator on the Segment With Punctured Points at Integral Perturbation of Transmission Conditions”. Journal of Mathematics, Mechanics and Computer Science 92 (4):32-39. https://bm.kaznu.kz/index.php/kaznu/article/view/451.