Adina Crainiceanu Prakash Linga Johannes Gehrke Jayavel Shanmugasundaram Querying Peer-to-Peer Networks Using P-Trees. 25-30 2004 conf/webdb/2004 WebDB db/conf/webdb/webdb2004.html#CrainiceanuLGS04 http://webdb2004.cs.columbia.edu/papers/2-2.pdf