Anqi Cui Min Zhang 0006 Yiqun Liu 0001 Shaoping Ma Kuo Zhang 0001 Discover breaking events with popular hashtags in twitter. 1794-1798 2012 CIKM https://doi.org/10.1145/2396761.2398519 conf/cikm/2012 db/conf/cikm/cikm2012.html#CuiZLMZ12