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\bibitem{Ma_etal2011} {\textquotedblleft}\textit{Enhanced biomethanation of kitchen waste by different pre-treatments}{\textquotedblright}. Ma J, Duong TH, Smits M, Verstraete W, Carballa M, Bioresource technology \textbf{102}, 592 (2011).   http://doi.org/10.1016/J.BIORTECH.2010.07.122

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