@article{weko_217713_1,
   author	 = "Hiroaki,Tohyama and Masaki,Tomisawa",
   title	 = "Complexity of the Police Officer Patrol Problem ",
   journal	 = "情報処理学会論文誌",
   year 	 = "2022",
   volume	 = "63",
   number	 = "4",
   month	 = "apr"
}