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\bibitem{Clauwaert_etal2017} {\textquotedblleft}\textit{Nitrogen cycling in bioregenerative life support systems : challenges for waste refinery and food production processes}{\textquotedblright}. Clauwaert P, Muys M, Alloul A, De Paepe J, Luther A, Sun X, Ilgrande C, Christiaens MER, Hu X, Zhang D, Lindeboom REF, Sas B, Rabaey K, Boon N, Ronsse F, Geelen D, Vlaeminck SE, Progress in aerospace sciences \textbf{91}, 87 (2017).   http://doi.org/10.1016/J.PAEROSCI.2017.04.002

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