@techreport{weko_182515_1,
   author	 = "Hiroshi,Ishijima and Takuro,Kazumi",
   title	 = "Clustering News to Create Sentiment Indexes that Help Predict Stock Prices",
   year 	 = "2017",
   institution	 = "Chuo University, CyberAgent, Inc.",
   number	 = "10",
   month	 = "jul"
}