1.
Yurko VA, Buterin SA, Pikula M. Sturm-Liouville differential operators with deviating argument. Tamkang J. Math. [Internet]. 2017 Mar. 30 [cited 2024 Apr. 24];48(1):49-5. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2264