Nicolas Liebau Vasilios Darlagiannis Oliver Heckmann Andreas Mauthe Accounting in Peer-to-Peer-Systems. 547-566 2005 conf/p2p/2005lncs Peer-to-Peer Systems and Applications http://dx.doi.org/10.1007/11530657_32 db/conf/p2p/p2p2005lncs.html#LiebauDHM05