ALI, Z. I.; ABEBE, M. A. A Front Fixing Crank-Nicolson Finite-Difference for the Solvability of the American Put Option Models. Contemporary Mathematics , [S. l.], v. 7, n. 1, p. 965–1007, 2026. DOI: 10.37256/cm.7120268649. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/8649. Acesso em: 8 feb. 2026.