?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Valbuena%2C+D&rft.aufirst=D&rft.aulast=Valbuena&rft.issn=0308-521X&rft.pages=107-118&rft.atitle=Identifying+determinants%2C+pressures+and+trade-offs+of+crop+residue+use+in+mixed+smallholder+farms+in+Sub-Saharan+Africa+and+South+Asia&rft.volume=134&rft.title=Agricultural+Systems&rft.date=2015&rft.genre=article