?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Homann-Kee+Tui%2C+S&rft.aufirst=S&rft.aulast=Homann-Kee+Tui&rft.issn=0308-521X&rft.pages=48-60&rft.atitle=Economic+trade-offs+of+biomass+use+in+crop-livestock+systems%3A+Exploring+more+sustainable+options+in+semi-arid+Zimbabwe&rft.volume=134&rft.title=Agricultural+Systems&rft.date=2015&rft.genre=article