Mike Boyle, Bryant Lee. Jointly Periodic Points in Cellular Automata: Computer Explorations and Conjectures. Experimental Mathematics, 16(3):293-302, 2007. [doi]
@article{BoyleL07,
title = {Jointly Periodic Points in Cellular Automata: Computer Explorations and Conjectures},
author = {Mike Boyle and Bryant Lee},
year = {2007},
doi = {10.1080/10586458.2007.10129005},
url = {http://dx.doi.org/10.1080/10586458.2007.10129005},
researchr = {https://researchr.org/publication/BoyleL07},
cites = {0},
citedby = {0},
journal = {Experimental Mathematics},
volume = {16},
number = {3},
pages = {293-302},
}