Ken Satoh Philippe Codognet Hiroshi Hosobe Speculative Constraint Processing in Multi-agent Systems. 133-144 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2891&spage=133 2003 conf/prima/2003 PRIMA db/conf/prima/prima2003.html#SatohCH03