Ulrich Endriss Wenjin Lu Nicolas Maudet Kostas Stathis Competent Agents and Customising Protocols. 168-181 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3071&spage=168 2003 conf/esaw/2003 ESAW db/conf/esaw/esaw2003.html#EndrissLMS03