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\bibitem{Maes_etal2015} {\textquotedblleft}\textit{Assessment of the sustainability guidelines of EU Renewable Energy Directive : the case of biorefineries}{\textquotedblright}. Maes D, Van Dael M, Vanheusden B, Goovaerts L, Reumerman P, Luzardo NM, Van Passel S, Journal Of Cleaner Production \textbf{88}, 61 (2015).   http://doi.org/10.1016/J.JCLEPRO.2014.04.051

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