?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Vu%2C+Thi+Hong+Nhan&rft.aulast=Vu&rft.aufirst=Thi+Hong+Nhan&rft.date=2004&rft.title=A+Data+Model+for+Region+with+Indeterminate+Boundaries&rft.genre=proceeding