| 1 | Irving H. Shames and Francis A. Cozzarelli, Elastic and Inelastic Stress Analysis, Prentice Hall, Englewood Cliffs, New Jersey 07632, 1992. |
| 2 | Jacob Lubliner, Plasticity Theory, Macmillian Publishing Company, New York, 1990. |
| 3 | William F Hosford and Robert M. Caddell, Metal Forming Mechanics and Metallurgy, PTR Prentice Hall, Englewood Cliffs, N.J. 07632, 1993. |