Yuping Zhou author Nianwen Xue author 2012-07 text Haizhou Li editor Chin-Yew Lin editor Miles Osborne editor Gary Geunbae Lee editor Jong C Park editor Association for Computational Linguistics Jeju Island, Korea conference publication zhou-xue-2012-pdtb https://aclanthology.org/P12-1008/ 2012-07 69 77