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\bibitem{Perego_etal2013} Perego, A., Giussani, A., Fumagalli, M., Sanna, M., Chiodini, M., Carozzi, M., et al. (2013). Crop rotation, fertilizer types and application timing affecting nitrogen leaching in nitrate vulnerable zones in Po Valley. \textit{Italian Journal of Agrometeorology}, \textit{3}(2), 39--50.

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