7Rees,W.E.Ecological footprints and appropriated carrying capacity:what urban economic leaves out,Environ.Urban,1992.4:121-130.
8Wang,R.and K rause,J.Towards a sustainable city:methods of urban ecological planning and its application in Tianjin,China,Verlags & Mediengesellschaft mbH,Berlin,1996.pp.191.
9Wang X.Ecological planning and sustainable development:a case study of an urban development zone in Shanghai,China.International Journal of Sustainability Development and World Ecology,1998.5(3):204-216
10Wolman,A.The metabolism of cities,Sci.Am.,1965.213(3):179-190.