DOFFOU, A. Estimating the Early Exercise Premium of American Put Index Options. International Journal of Banking and Finance, [S. l.], v. 6, n. 1, p. 31–47, 2009. Disponível em: https://e-journal.uum.edu.my/index.php/ijbf/article/view/8381. Acesso em: 5 may. 2024.