6ANAGNOSTAKIS K G,GREENWALD M B.Exchange-based incentive mechanisms for Peer-to-Peer file sharing[EB/OL].(2002-10-30) [2003-05-03] http://www.cis.upenn.edu/～ anagnost/papers/exchange-final.pdf.
7KUNG H T,WU Chun-hsin.Differentiated admission for Peer-to-Peer systems:incentivizing peers to contribute their resources [EB/OL].(2003-12-21) [2005-03-03] http://www.sims.berkeley.edu/research/conferences/p2pecon/papers/s5-kung.pdf.
8BURAGOHAIN C,AGRAWAL D,SURI S.A game theoretic framework for incentives in P2P systems [EB/OL].(2003-12-11)[2003-05-03] http://www.cs.ucsb.edu/～suri/psdir/incentives.pdf.
9MA Richard T B,SEE Sam C M,LUI John C S.A game theoretic approach to provide incentive and service differentiation in P2P networks[EB/OL].(2003-12-20) [2005-05-03] http://portal.acm.org/ft _ gateway.cfm? id= 1005711 & type= pdf.
10WU T,MALKIN M,BONEH M D.Building intrusion-tolerant application[A].In:Proceedings of the USENIX Security Symposium[C].1999.79-91.
