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\bibitem{Peng_etal2017} {\textquotedblleft}\textit{Smart operation of nitritation/denitritation virtually abolishes nitrous oxide emission during treatment of co-digested pig slurry centrate}{\textquotedblright}. Peng L, Carvajal-Arroyo JM, Seuntjens D, Prat D, Colica G, Pintucci C, Vlaeminck SE, Water research \textbf{127}, 1 (2017).   http://doi.org/10.1016/J.WATRES.2017.09.049

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