Olǧar H, Muhtarov F, Mukhtarov O. Operator-pencil treatment of multi-interval Sturm-Liouville equation with boundary-transmission conditions. M [Internet]. 2024 Sep. 30 [cited 2025 Jul. 10];115(3):126-3. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/820