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\bibitem{Ang_etal2011} {\textquotedblleft}\textit{An aggregate resource efficiency perspective on sustainability : a sustainable value application to the EU-15 countries}{\textquotedblright}. Ang F, Van Passel S, Mathijs E, Ecological Economics \textbf{71}, 99 (2011).   http://doi.org/10.1016/J.ECOLECON.2011.08.008

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