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\bibitem{Ang+VanPassel2010} {\textquotedblleft}\textit{The sustainable value approach : a clarifying and constructive comment}{\textquotedblright}. Ang F, Van Passel S, Ecological Economics \textbf{69}, 2303 (2010).   http://doi.org/10.1016/J.ECOLECON.2010.05.016

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