@article{weko_95645_1,
   author	 = "Kazuya,Haraguchi",
   title	 = "The Number of Inequality Signs in the Design of Futoshiki Puzzle",
   journal	 = "Journal of information processing",
   year 	 = "2013",
   volume	 = "21",
   number	 = "1",
   pages	 = "26--32",
   month	 = "jan"
}