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\bibitem{VanPassel_etal2009} {\textquotedblleft}\textit{Sustainable value assessment of farms using frontier efficiency benchmarks}{\textquotedblright}. Van Passel S, Van Huylenbroeck G, Lauwers L, Mathijs E, Journal Of Environmental Management \textbf{90}, 3057 (2009).   http://doi.org/10.1016/J.JENVMAN.2009.04.009

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