?url_ver=Z39.88-2004&rft_id=10.20868%2FUPM.thesis.448&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Sergio&rft.aulast=Guadarrama+Cotado&rft.au=Guadarrama+Cotado%2C+Sergio&rft.tpages=246&rft.date=March+2007&rft.inst=Facultad+de+Inform%C3%A1tica+(UPM)+%3Chttps%3A%2F%2Foa.upm.es%2Fview%2Finstitution%2FInformatica%2F%3E&rft.title=A+contribution+to+computing+with+words%2Fperceptions+%3D+Contribuci%C3%B3n+al+estudio+de+la+computaci%C3%B3n+con+palabras%2Fpercepciones&rft.degree=Doctoral