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\bibitem{Seuntjens_etal2018} {\textquotedblleft}\textit{Pinpointing wastewater and process parameters controlling the AOB to NOB activity ratio in sewage treatment plants}{\textquotedblright}. Seuntjens D, Han M, Kerckhof F-M, Boon N, Al-Omari A, Takacs I, Meerburg F, De Mulder C, Wett B, Bott C, Murthy S, Carvajal Arroyo JM, De Clippeleir H, Vlaeminck SE, Water research \textbf{138}, 37 (2018).   http://doi.org/10.1016/J.WATRES.2017.11.044

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