?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=G&rft.au=Schmidt%2C+G&rft.aulast=Schmidt&rft.date=1990&rft.title=Importance+of+Rotation+with+Groundnut+for+Cereal+Productivity&rft.genre=proceeding