Masayuki Hanadate Masayuki Terada Shinji Nagao Toshiyuki Miyazawa Yukiko Yosuke Seiji Tomita Ko Fujimura P2P Digital Value Fair Trading System Using Smart Cards. 18-30 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3450&spage=18 2005 conf/spc/2005 SPC db/conf/spc/spc2005.html#HanadateTNMYTF05