Nikos Ntarmos Peter Triantafillou AESOP: Altruism-Endowed Self-organizing Peers. 151-165 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3367&spage=151 2004 conf/dbisp2p/2004 DBISP2P db/conf/dbisp2p/dbisp2p2004.html#NtarmosT04