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2. Turning sustainability into action: explaining firms’ sustainability efforts and their impact on firm performance;Schrettle;Int. J. Prod. Econ.,2014
3. http://esa.un.org/unup/Analytical-Figures/Fig_overview.htm.
4. http://www.oecd.org/dac/povertyreduction/36301078.pdf.
5. http://www.fhwa.dot.gov/hfl/.