Pečiulytė, Sigita, and Artūras Štikonas. “On Positive Eigenfunctions of Sturm‐Liouville Problem With Nonlocal two‐point Boundary Condition”. Mathematical Modelling and Analysis 12, no. 2 (June 30, 2007): 215-226. Accessed November 25, 2024. https://gc.vgtu.lt/index.php/MMA/article/view/7123.