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\bibitem{Ang+VanPassel2012} {\textquotedblleft}\textit{Beyond the environmentalist{\textquoteright}s paradox and the debate on weak versus strong sustainability}{\textquotedblright}. Ang F, Van Passel S, Bioscience \textbf{62}, 251 (2012).   http://doi.org/10.1525/BIO.2012.62.3.6

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