?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S&rft.au=Nakamura%2C+S&rft.aulast=Nakamura&rft.atitle=Validation+of+soil+organic+carbon+dynamics+model+in+the+semi-arid+tropics+in+Niger%2C+West+Africa&rft.title=Nutrient+Cycling+in+Agroecosystems&rft.date=2011&rft.volume=89&rft.pages=375-385&rft.genre=article