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\bibitem{Klosterhalfen_etal2017} Klosterhalfen, A., Herbst, M., Weihermueller, L., Graf, A., Schmidt, M., Stadler, A., et al. (2017). Multi-site calibration and validation of a net ecosystem carbon exchange model for croplands. \textit{Ecol. Model.}, \textit{363}, 137--156.

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