?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Timler%2C+C&rft.aufirst=C&rft.aulast=Timler&rft.date=March+2015&rft.title=Exploring+options+for+sustainable+intensification+in+different+farming+system+types+of+four+Africa+RISING+countries&rft.genre=proceeding