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\bibitem{Christis_etal2015} {\textquotedblleft}\textit{Value in sustainable materials management strategies for open economies case of Flanders (Belgium)}{\textquotedblright}. Christis M, Geerken T, Vercalsteren A, Vrancken KCM, Resources, conservation and recycling \textbf{103}, 110 (2015).   http://doi.org/10.1016/J.RESCONREC.2015.07.014

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