Alexander Löser Felix Naumann Wolf Siberski Wolfgang Nejdl Uwe Thaden Semantic Overlay Clusters within Super-Peer Networks. 33-47 http://dx.doi.org/10.1007/978-3-540-24629-9_4 2003 conf/dbisp2p/2003 DBISP2P db/conf/dbisp2p/dbisp2p2003.html#LoserNSNT03