@inproceedings{weko_109654_1,
   author	 = "工藤剛 and 中山伸一 and 真栄城哲也",
   title	 = "特許分類の時系列データを用いた技術進展の計量化",
   booktitle	 = "第74回全国大会講演論文集",
   year 	 = "2012",
   volume	 = "2012",
   number	 = "1",
   pages	 = "621--622",
   month	 = "mar"
}