?url_ver=Z39.88-2004&rft_id=JA+1611&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Singh%2C+P&rft.aufirst=P&rft.aulast=Singh&rft.issn=0378-4290&rft.pages=163-170&rft.atitle=Evaluation+of+the+groundnut+model+PNUTGRO+for+crop+response+to+plant+population+and+row+spacing&rft.volume=39&rft.issue=2-3&rft.title=Field+Crops+Research&rft.date=1994&rft.genre=article