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\bibitem{Chua_etal2003} Chua, A. S. M., Takabatake, H., Satoh, H., \& Mino, T. (2003). Production of polyhydroxyalkanoates (PHA) by activated sludge treating municipal wastewater: effect of pH, sludge retention time (SRT), and acetate concentration in influent. \textit{Water Res}, \textit{37}(15), 3602--3611.

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