A Method of K-Means Clustering Based on TF-IDF for Software Requirements Documents Written in Chinese Language 論文 Jing ZHU・Song HUANG・Yaqing SHI・Kaishun WU・Yanqiu WANG ·2022 ·『IEICE Transactions on Information and Systems』 E105.D(4) pp. 736-754 doi:10.1587/transinf.2021EDP7144