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 November 12, 2024. https://transport.vilniustech.lt/index.php/MMA/article/view/13056.