Namrata Lele Le-Shin Wu Ruj Akavipat Filippo Menczer Sixearch.org 2.0 peer application for collaborative web search. 333-334 2009 Hypertext http://doi.acm.org/10.1145/1557914.1557974 conf/ht/2009 db/conf/ht/ht2009.html#LeleWAM09