Juan-Zi Li Gui-Rong Xue Jie Tang Ying Ding WWW 2008 workshop on social web search and mining: SWSM2008. 1281-1282 2008 WWW http://doi.acm.org/10.1145/1367497.1367768 conf/www/2008 db/conf/www/www2008.html#LiXTD08