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\bibitem{Schils_etal2018} Schils, R., Olesen, J. E., Kersebaum, K. - C., Rijk, B., Oberforster, M., Kalyada, V., et al. (2018). Cereal yield gaps across Europe. \textit{Europ. J. Agron.}, \textit{101}, 109--120.

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