Chao Zhou Guang Qiu Kangmiao Liu Jiajun Bu Mingcheng Qu Chun Chen SOPING: a Chinese customer review mining system. 741-742 2008 SIGIR http://doi.acm.org/10.1145/1390334.1390480 conf/sigir/2008 db/conf/sigir/sigir2008.html#ZhouQLBQC08