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\bibitem{Hoogmartens_etal2018} {\textquotedblleft}\textit{A Hotelling model for the circular economy including recycling, substitution and waste accumulation}{\textquotedblright}. Hoogmartens R, Eyckmans J, Van Passel S, Resources Conservation And Recycling \textbf{128}, 98 (2018).   http://doi.org/10.1016/J.RESCONREC.2017.09.015

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