Ryong Lee Daisuke Kitayama Kazutoshi Sumiya Web-based evidence excavation to explore the authenticity of local events. 63-66 2008 WICOW http://doi.acm.org/10.1145/1458527.1458543 conf/cikm/2008wicow db/conf/cikm/wicow2008.html#LeeKS08