?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Lee+%2C+Ya+Ling&rft.aulast=Lee+&rft.aufirst=Ya+Ling&rft.date=2002&rft.title=Using+E-learning+to+enhance+the+learning+of+graph+transformations&rft.genre=proceeding