Finding Problem Solving Threads in Online Forum Zhonghua Qu author Yang Liu author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication qu-liu-2011-finding https://aclanthology.org/I11-1164/ 2011-11 1413 1417