?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.entcs.2006.10.056&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Luis&rft.au=Caires%2C+Luis&rft.aulast=Caires&rft.pages=131+-+149&rft.issn=1571-0661&rft.atitle=Extensionality+of+spatial+observations+in+distributed+systems+&rft.title=Electronic+Notes+in+Theoretical+Computer+Science&rft.date=2007&rft.issue=3&rft.volume=175&rft.genre=article