Cabri, Olgun, and Suayip Toprakseven. “On <i>q</I> Sturm Liouville Operator With Periodic Boundary Conditions”. Contemporary Mathematics 5, no. 4 (October 16, 2024): 4309–4322. Accessed October 18, 2024. https://ojs.wiserpub.com/index.php/CM/article/view/5208.