?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Wang%2C+Z&rft.aufirst=Z&rft.aulast=Wang&rft.atitle=Virtual+water+flow+pattern+of+grain+trade+and+its+benefits+in+China&rft.date=20+June+2019&rft.pages=445-455&rft.issn=0959-6526&rft.title=Journal+of+Cleaner+Production&rft.volume=223&rft.genre=article