@article{weko_80335_1,
   author	 = "Hiroshi,Ishii and Qiang,Ma and Masatoshi,Yoshikawa",
   title	 = "Incremental Construction of Causal Network from News Articles",
   journal	 = "Journal of information processing",
   year 	 = "2012",
   volume	 = "20",
   number	 = "1",
   pages	 = "207--215",
   month	 = "jan"
}