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\bibitem{Hoffmann_etal2017} Hoffmann, M. P., Haakana, M., Asseng, S., H{\"o}hn, J. G., Palosuo, T., Ruiz-Ramos, M., et al. (2017). How does inter-annual variability of attainable yield affect the magnitude of yield gaps for wheat and maize? An analysis at ten sites. \textit{Agric. Syst.}, , in press.

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