Ali, Zakaria Idriss, and Minyahil Abera Abebe. “A Front Fixing Crank-Nicolson Finite-Difference for the Solvability of the American Put Option Models”. Contemporary Mathematics 7, no. 1 (January 27, 2026): 965–1007. Accessed February 8, 2026. https://ojs.wiserpub.com/index.php/CM/article/view/8649.