?url_ver=Z39.88-2004&rft_id=10.1109%2FSCORED.2007.4451440&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=B.&rft.au=Erfianto%2C+B.&rft.aulast=Erfianto&rft.isbn=1424414709%3B+9781424414703&rft.title=Modeling+context+and+exchange+format+for+context-aware+computing&rft.date=2007&rft.genre=proceeding