?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Gordon&rft.aulast=Simpson&rft.au=Simpson%2C+Gordon&rft.volume=22&rft.issue=2&rft.date=April+2006&rft.title=Journal+of+Computer+Assisted+Learning&rft.atitle=Exploring+the+mathematics+of+motion+through+construction+and+collaboration&rft.pages=114-136&rft.issn=0266-4909&rft.genre=article