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Nonlinear science and its application to earth science. Lin Z S. Meteorology Press . 2003
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Applying physical input/output analysis to estimate land appropriation(Ecological Footprints)of international trade activities. Klaus Hubacek,Stefan Giljum. Ecological Economics . 2003
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New Methodologyfor the ecological footprint with an applicationtothe NewZealand economy. Katheyn B,Bicknell. Ecological Economics . 1998