Kazuya Haraguchi. The Number of Inequality Signs in the Design of Futoshiki Puzzle. JIP, 21(1):26-32, 2013. [doi]
@article{Haraguchi13, title = {The Number of Inequality Signs in the Design of Futoshiki Puzzle}, author = {Kazuya Haraguchi}, year = {2013}, doi = {10.2197/ipsjjip.21.26}, url = {http://dx.doi.org/10.2197/ipsjjip.21.26}, researchr = {https://researchr.org/publication/Haraguchi13}, cites = {0}, citedby = {0}, journal = {JIP}, volume = {21}, number = {1}, pages = {26-32}, }