@techreport{weko_31809_1,
   author	 = "中山,裕貴 and 森山,園子 and 福田,公明 and 岡本,吉央",
   title	 = "双二次最終多項式による有向マトロイドの実現不可能性判定",
   year 	 = "2005",
   institution	 = "東京大学大学院情報理工学系研究科, Department of Mathematics  Swiss Federal Institute of Technology Zurich, Department of Mathematics  Swiss Federal Institute of Technology Lausanne, Department of Computer Science  Swiss Federal Institute of Technology Zurich",
   number	 = "5(2004-AL-099)",
   month	 = "jan"
}