Frank Dignum Jan Broersen Virginia Dignum John-Jules Ch. Meyer Meeting the Deadline: Why, When and How. 30-40 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3228&spage=30 2004 conf/faabs/2004 FAABS db/conf/faabs/faabs2004.html#DignumBDM04