@article{weko_11725_1,
   author	 = "Fumiaki,Kanezashi and Atsushi,Togashi",
   title	 = "System Requirements and Formal Specifications of Hierarchical Reactive Systems",
   journal	 = "情報処理学会論文誌",
   year 	 = "2002",
   volume	 = "43",
   number	 = "2",
   pages	 = "361--371",
   month	 = "feb"
}