Takashi Hashimoto Yuya Kumagai Meta-evolutionary Game Dynamics for Mathematical Modelling of Rules Dynamics. 107-117 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2801&spage=107 2003 conf/ecal/2003 ECAL db/conf/ecal/ecal2003.html#HashimotoK03