Yannis Petrakis Evaggelia Pitoura On Constructing Small Worlds in Unstructured Peer-to-Peer Systems. 415-424 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3268&spage=415 2004 conf/edbtw/2004 EDBT Workshops db/conf/edbtw/edbtw2004.html#PetrakisP04