@techreport{weko_40011_1,
   author	 = "酒井,哲也",
   title	 = "Comparing Metrics across TREC and NTCIR : The Robustness to System Bias",
   year 	 = "2008",
   institution	 = "NewsWatch  Inc.",
   number	 = "56(2008-FI-091)",
   month	 = "jun"
}