?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Hugo+&rft.aulast=Torres+Vieira&rft.au=Torres+Vieira%2C+Hugo+&rft.title=A+calculus+for+modeling+and+analyzing+conversations+in+service-oriented+computing&rft.inst=Universidade+nova+de+Lisboa&rft.date=2010&rft.degree=PhD+Thesis&rft.tpages=310