@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042630, author = {Hisano, Ryohei and Sornette, Didier and Mizuno, Takayuki and Ohnishi, Takaaki and Watanabe, Tsutomu}, month = {Oct}, note = {2012~2016年度科学研究費補助金[基盤研究(S)]「長期デフレの解明」(研究代表者 東京大学経済学研究科・渡辺努, 課題番号:24223003)}, title = {High quality topic extraction from business news explains abnormal financial market volatility}, year = {2012} }