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\bibitem{Meul_etal2012} {\textquotedblleft}\textit{Higher sustainability performance of intensive grazing versus zero-grazing dairy systems}{\textquotedblright}. Meul M, Van Passel S, Fremaut D, Haesaert G, Agronomy For Sustainable Development \textbf{32}, 629 (2012).   http://doi.org/10.1007/S13593-011-0074-5

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