A Bottom-up Merging Algorithm for Chinese Unknown Word Extraction Wei-Yun Ma author Keh-Jiann Chen author 2003-07 text Proceedings of the Second SIGHAN Workshop on Chinese Language Processing Association for Computational Linguistics Sapporo, Japan conference publication ma-chen-2003-bottom 10.3115/1119250.1119255 https://aclanthology.org/W03-1705/ 2003-07 31 38