4Rees W E.Ecological footprints and appropriated carrying capacity:what urban economics leaves out[J].Environ Urban,1992,4(2):121-130.
5Wackernagel M,William E R.Our ecological footprint:reducing human impact on the earth[M].Gabrila Isoland,B.C:New Society Publishers,1996.
6Bergh V D,Verbruggn H.Spatial sustainability,trade and indicators:An evaluation of the ‘ecological footprint'[J].Ecological Economics,1999,(29):61-72.