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\bibitem{Wang_etal2017} {\textquotedblleft}\textit{Approach of describing dynamic production of volatile fatty acids from sludge alkaline fermentation}{\textquotedblright}. Wang D, Liu Y, Ngo HH, Zhang C, Yang Q, Peng L, He D, Zeng G, Li X, Ni B-J, Bioresource technology \textbf{238}, 343 (2017).   http://doi.org/10.1016/J.BIORTECH.2017.04.054

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