Şen, Erdoğan, and Artūras Štikonas. “Asymptotic Distribution of Eigenvalues and Eigenfunctions of a Nonlocal Boundary Value Problem”. Mathematical Modelling and Analysis 26, no. 2 (May 26, 2021): 253–266. Accessed May 13, 2025. https://journals.vilniustech.lt/index.php/MMA/article/view/13056.