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\bibitem{Spiller_etal2022} {\textquotedblleft}\textit{Environmental and economic sustainability of the nitrogen recovery paradigm : evidence from a structured literature review}{\textquotedblright}. Spiller M, Moretti M, De Paepe J, Vlaeminck SE, Resources, conservation and recycling \textbf{184}, 106406 (2022).   http://doi.org/10.1016/J.RESCONREC.2022.106406

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