@article{weko_91574_1,
   author	 = "Satoshi,Tojo and Keiji,Hirata",
   title	 = "Distance and Similarity of Time-span Trees",
   journal	 = "情報処理学会論文誌",
   year 	 = "2013",
   volume	 = "54",
   number	 = "4",
   month	 = "apr"
}