Junfeng Xie Zhenhua Li Guihai Chen A semantic overlay network for unstructured peer-to-peer protocols. 1-8 2007 ICPADS http://doi.ieeecomputersociety.org/10.1109/ICPADS.2007.4447757 conf/icpads/2007 db/conf/icpads/icpads2007.html#XieLC07