Chen Lin Jiang-Ming Yang Rui Cai Xin-Jing Wang Wei Wang 0009 Lei Zhang Modeling semantics and structure of discussion threads. 1103-1104 2009 WWW http://doi.acm.org/10.1145/1526709.1526877 conf/www/2009 db/conf/www/www2009.html#LinYCWWZ09