?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R+B&rft.au=Jones%2C+R+B&rft.aulast=Jones&rft.atitle=The+role+of+informal+seed+systems+in+disseminating+modern+varieties%3A+example+of+pigeon+pea+in+semi-arid+area+of+Kenya&rft.title=Experimental+Agriculture&rft.issn=0014-4797&rft.date=2001&rft.volume=37&rft.pages=539-548&rft.issue=4&rft.genre=article