?url_ver=Z39.88-2004&rft_id=http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.ejor.2015.02.042&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Singbo%2C+A&rft.aufirst=A&rft.aulast=Singbo&rft.issn=0377-2217&rft.pages=265-272&rft.atitle=Estimating+shadow+prices+and+efficiency+analysis+of+productive+inputs+and+pesticide+use+of+vegetable+production&rft.volume=245&rft.issue=1&rft.title=European+Journal+of+Operational+Research&rft.date=16+August+2015&rft.genre=article