NOKIA Research Center Beijing Chinese Word Segmentation System for the SIGHAN Bakeoff 2007 Jiang Li author Rile Hu author Guohua Zhang author Yuezhong Tang author Zhanjiang Song author Xia Wang author 2008 text Proceedings of the Sixth SIGHAN Workshop on Chinese Language Processing conference publication li-etal-2008-nokia https://aclanthology.org/I08-4012/ 2008