Z. M. Abdiakhmetova, Najibullah Zahid, Feroz Sheakib, and Ghulam Hazrat Aimal Rasa. “Degenerate Sturm-Liouville Problem for Second-Order Differential Operators on Star-Graph”. Journal of Mathematics and Statistics Studies 5, no. 3 (July 25, 2024): 01–08. Accessed June 16, 2026. https://al-kindipublishers.org/index.php/jmss/article/view/7524.