?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Healy%2C+Lulu&rft.aufirst=Lulu&rft.aulast=Healy&rft.date=2000&rft.title=Journal+for+Research+in+Mathematics+Education&rft.atitle=A+study+of+proof+conceptions+in+algebra&rft.pages=396-428&rft.issn=0021-8251&rft.volume=31&rft.issue=4&rft.genre=article