?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Dang%2C+Duc+Hanh&rft.aulast=Dang&rft.aufirst=Duc+Hanh&rft.date=2009&rft.title=Precise+Model-Driven+Transformations+Based+on+Graphs+and+Metamodels&rft.genre=proceeding