1. C. F. Gerald:Applied Numerical Analysis, 2nd ed., Addison-Wesley, Reading, MA, 1980, p. 3.
2. C. F. Gerald:Applied Numerical Analysis, 2nd ed., Addison-Wesley, Reading, MA, 1980, p. 474.
3. D. C. Ludwigson and J. A. Berger:.J. Iron Steel Inst., 1969, vol. 207, p. 63.
4. V. F. Zackay, E. R. Parker, D. Fahr, and R. Bush:Trans. ASM, 1967, vol. 60, p. 252.
5. T. Angel:J. Iron Steel Inst., 1954, vol. 177, p. 165.