3Mcdonnell M, S T A Pickett.Connectivity and the theory of landscape ecology[A]. K F Schreiber: Connectivity in landscape ecology, Proceeding of the 2nd International Seminar of the "International Association for landscape ecology", Munstersche Geographische Arbeiten[C].Munster,1988, 29, 17-19.
4B B Mandelbrot. The tracta geometry of nature[M]. New York :W H Freeman & Co,1983.
5Peitgen H O, Sanpe D.The Science of Fractal Images[M]. New York :Springer-Verlag,1988.