Estimating Business Sentiment from News Texts. - Kazuhiro Seki; Yusuke Ikuta (AIKE, 2019)

S-APIR: News-Based Business Sentiment Index. - Kazuhiro Seki; Yusuke Ikuta (ADBIS (Short Papers), 2020)

News-based business sentiment and its properties as an economic index. - Kazuhiro Seki; Yusuke Ikuta; Yoichi Matsubayashi (Inf. Process. Manag., 2022)