Semi-supervised Chinese Word Segmentation for CLP2012 Saike He author Nan He author Songxiang Cen author Jun Lu author 2012-12 text Proceedings of the Second CIPS-SIGHAN Joint Conference on Chinese Language Processing Association for Computational Linguistics Tianjin, China conference publication he-etal-2012-semi https://aclanthology.org/W12-6315/ 2012-12 79 84