Bingelė, Kristina, and Artūras Štikonas. “Investigation of a Discrete Sturm–Liouville Problem With Two-Point Nonlocal Boundary Condition and Natural Approximation of a Derivative in Boundary Condition”. Mathematical Modelling and Analysis 29, no. 2 (March 26, 2024): 309–330. Accessed November 24, 2024. https://jau.vgtu.lt/index.php/MMA/article/view/19829.