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\bibitem{VanPassel_etal2007} {\textquotedblleft}\textit{Measuring farm sustainability and explaining differences in sustainable efficiency}{\textquotedblright}. Van Passel S, Nevens F, Mathijs E, Van Huylenbroeck G, Ecological Economics \textbf{62}, 149 (2007).   http://doi.org/10.1016/J.ECOLECON.2006.06.008

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