Erika Valencia Jean-Paul Sansonnet Model for Dialogue between Informational Agents. 355-359 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2902&spage=355 2003 conf/epia/2003 EPIA db/conf/epia/epia2003.html#ValenciaS03