1. W. Engelmaier and A. Wagner, Circuit World 14, 30 (1988).
2. T.H. Courtney, Mechanical Behavior of Materials (New York: McGraw-Hill, 1990), p. 562.
3. M.A. Meyers and K.K. Chawla, Mechanical Metallurgy: Principles and Applications (Englewood Cliffs, NJ: Prentice-Hall, 1984), p, 688.
4. N.E. Dowling, Mechanical Behavior of Materials (Englewood Cliffs, NJ: Prentice-Hall, 1993), p. 621.
5. ASTM STP;J.D. Morrow,1996