Michal Kolarz, Wlodzimierz Moczurad. Directed figure codes are decidable. Discrete Mathematics & Theoretical Computer Science, 11(2):1-14, 2009. [doi]
@article{KolarzM09,
title = {Directed figure codes are decidable},
author = {Michal Kolarz and Wlodzimierz Moczurad},
year = {2009},
url = {http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/1106},
researchr = {https://researchr.org/publication/KolarzM09},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics & Theoretical Computer Science},
volume = {11},
number = {2},
pages = {1-14},
}