1. Mandelbrot, B. B.,The Fractal Geometry of Nature, San Fransisco: Freeman, 1983, 1–3.
2. Long, C. W., Mu, Z. Q., Limited level fractal structures and fracture behavior of solid state materials,Science in China ( in Chinese), Ser. A, 1994, 24(1): 94.
3. Zhang, Y., Chu, W. Y., Wang, Y. B. et a1., Study of cleavage fracture surface of TiAl alloys at nanometer scale,Acta Metall. Sinica (in Chinese), 1995, A31(5): 191.
4. Bai, C. L.,Scanning Tunneling Microscopy and Its Applications ( in Chinese ), Shanghai: Shanghai Sci. and Tech. Press, 1993, 1–15.
5. Mitchell, M. W., Bonnell, D. A., Quantitative topographic analysis of fractal surfaces by scanning tunneling micmscopy,J. Mat. Res., 1990, 5(10): 2244.