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\bibitem{Jochems_etal2015} {\textquotedblleft}\textit{Active site titration of immobilized beta-galactosidase for the determination of active enzymes}{\textquotedblright}. Jochems P, Mueller T, Satyawali Y, Diels L, Dejonghe W, Hanefeld U, Biochemical engineering journal \textbf{93}, 137 (2015).   http://doi.org/10.1016/J.BEJ.2014.10.007

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