Mihai Ciucu, Tri Lai. Proof of Blum's conjecture on hexagonal dungeons. Journal of Combinatorial Theory, Series A, 125:273-305, 2014. [doi]
@article{CiucuL14,
title = {Proof of Blum's conjecture on hexagonal dungeons},
author = {Mihai Ciucu and Tri Lai},
year = {2014},
doi = {10.1016/j.jcta.2014.03.008},
url = {http://dx.doi.org/10.1016/j.jcta.2014.03.008},
researchr = {https://researchr.org/publication/CiucuL14},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {125},
pages = {273-305},
}