?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=W+D&rft.au=Dar%2C+W+D&rft.aulast=Dar&rft.date=2000&rft.title=An+assessment+of+technology+development+from+the+Green+Revolution+to+today&rft.genre=proceeding