@techreport{weko_59124_1,
   author	 = "直井,隆徳",
   title	 = "情報の価値の変動と消尽概念",
   year 	 = "2000",
   institution	 = "沖電気工業株式会社知的財産権センタ",
   number	 = "13(1999-IM-036)",
   month	 = "jan"
}