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\bibitem{Meul_etal2008} {\textquotedblleft}\textit{MOTIFS : a monitoring tool for integrated farm sustainability}{\textquotedblright}. Meul M, Van Passel S, Nevens F, Dessein J, Rogge E, Mulier A, Van Hauwermeiren A, Agronomy For Sustainable Development \textbf{28}, 321 (2008).   http://doi.org/10.1051/AGRO:2008001

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