Carlo Sartiani On the Correctness of Query Results in XML P2P Databases. 18-25 2004 conf/p2p/2004 Peer-to-Peer Computing http://csdl.computer.org/comp/proceedings/p2p/2004/2156/00/21560018abs.htm db/conf/p2p/p2p2004.html#Sartiani04