?url_ver=Z39.88-2004&rft_id=10.1109%2FNatPC.2011.6136293&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=S.Z.M.&rft.aulast=Yusof&rft.au=Yusof%2C+S.Z.M.&rft.date=2011&rft.title=Representing+pre-trip+transit+information+as+graph+with+constraints&rft.isbn=9781457718847&rft.genre=proceeding