?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Grassini%2C+P&rft.aufirst=P&rft.aulast=Grassini&rft.issn=0378-4290&rft.pages=49-63&rft.atitle=How+good+is+good+enough%3F+Data+requirements+for+reliable+crop+yield+simulations+and+yield-gap+analysis&rft.volume=177&rft.title=Field+Crops+Research&rft.date=June+2015&rft.genre=article