1. M. Ahmed, An exploration of compact finite difference methods for the numerical solution of PDE, Ph.D. Thesis, the University of Western Ontario, 1997.
2. Approximations for the values of American options;Barone-Adesi;Stochast. Anal. Appl.,1991
3. G. Barone-Adesi, U. Lugano, The saga of the American put, 2003.
4. G. Barone-Adesi, R. Whaley, Efficient analytic approximation of American option values, J. Finance (1987) 301–320.
5. Numerical Analysis and Computation: Theory and Practice;Blum,1972