@techreport{weko_40448_1,
   author	 = "城塚音也",
   title	 = "テキストマイニングにおける概念関係視覚化方式の検討",
   year 	 = "2001",
   institution	 = "株式会社NTTデータ開発本部",
   number	 = "44(2001-FI-062)",
   month	 = "may"
}