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\bibitem{VanPassel+Meul2012} {\textquotedblleft}\textit{Multilevel and multi-user sustainability assessment of farming systems}{\textquotedblright}. Van Passel S, Meul M, Environmental Impact Assessment Review \textbf{32}, 170 (2012).   http://doi.org/10.1016/J.EIAR.2011.08.005

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