Wen Ji Shoubao Yang Fuli Liu Sustained Online Duration - based Reputation Management for File-Sharing Peer-to-Peer Systems. 94-97 2008 CSSE (3) http://dx.doi.org/10.1109/CSSE.2008.507 conf/csse/2008-3 db/conf/csse/csse2008-3.html#JiYL08