?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Fahmi%2C+Marco&rft.aulast=Fahmi&rft.aufirst=Marco&rft.date=2007&rft.title=The+Ontological+Commitments+of+Mathematical+Models&rft.genre=proceedin