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http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2014/05/27/000456286_20140527095323/Rendered/PDF/882840AR0REPLA00EPI2102680Box385232.pdf
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http://ec.europa.eu/clima/policies/ets/linking/docs/final_report_en.pdf