Roman Kurmanowytsch Mehdi Jazayeri Engin Kirda Towards a Hierarchical, Semantic Peer-to-Peer Topology. 167-168 2002 conf/p2p/2002 Peer-to-Peer Computing http://csdl.computer.org/comp/proceedings/p2p/2002/1810/00/18100167abs.htm db/conf/p2p/p2p2002.html#KurmanowytschJK02