1. R.T. DeHoff and F.N. Rhines, Quantitative Microscopy (New York: McGraw-Hill, Inc., 1968).
2. E.E. Underwood, Metals Handbook, 9th ed. (Metals Park, OH: ASM, 1985), p. 1221.
3. G.F. Vander Voort, Metallography: Principles and Practice (New York: McGraw-Hill, 1984).
4. B.B. Mandelbrot, The Fractal Geometry of Nature (New York: W.H. Freeman and Company, 1982).
5. J. Feder, Fractals (New York: Plenum Press, 1988).