@article{weko_79534_1,
   author	 = "Hiroshi,Ishii and Qiang,Ma and Masatoshi,Yoshikawa",
   title	 = "Incremental Construction of Causal Network from News Articles",
   journal	 = "情報処理学会論文誌",
   year 	 = "2011",
   volume	 = "52",
   number	 = "12",
   month	 = "dec"
}