@techreport{weko_95742_1,
   author	 = "Asahi,Takaoka and Satoshi,Tayu and Shuichi,Ueno",
   title	 = "A Note on Two-Directional Orthogonal Ray Graphs and Related Graphs",
   year 	 = "2013",
   institution	 = "Department of Communications and Computer Engineering, Tokyo Institute of Technology, Department of Communications and Computer Engineering, Tokyo Institute of Technology, Department of Communications and Computer Engineering, Tokyo Institute of Technology",
   number	 = "17",
   month	 = "oct"
}