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2. Emission inventory for green house gases in the City of Barcelona, 1987–1996;Baldasano;Atmospheric Environment,1999
3. China Environmental Yearbook Compilation Committee (CEYCC), 2001. China Environmental Yearbook 2001 (in Chinese).
4. Chongqing Statistical Yearbook;Chongqing Statistical Bureau (CSB),2001
5. Water use in the Spanish economy: an input–output approach;Duarte;Ecological Economics,2002