@techreport{weko_32662_1,
   author	 = "J.DÜrstMartin and L..KuniiTosiyasu",
   title	 = "Vertex Classification using the Convex Hull on a Sphere",
   year 	 = "1989",
   institution	 = "Department of Information Science  Faculty of Science The University of Tokyo, Department of Information Science  Faculty of Science The University of Tokyo",
   number	 = "98(1989-AL-012)",
   month	 = "nov"
}