8MANDELBROT B. The variation of the price of cotton, wheat, and railroad stocks, and of some financial rates[J]. Journal of Business, 1967,40 : 393-413.
9ADRANGI Bahram, CHATRATH Arjun, KATHY Kanwal- roop Dhand, et al. Chaos in oil prices? : Evidence from futures markets [J]. Energy Econmics, 2001, 27:405-425.
10KIM H S, EYKHOLT R, SALASJ D. Nonlinear dynamics, delay times, and embedding windows[J]. Physica, 1999,127 : 48-60.
