Luke Schaeffer. A Physically Universal Cellular Automaton. Electronic Colloquium on Computational Complexity (ECCC), 21:84, 2014. [doi]
@article{Schaeffer14, title = {A Physically Universal Cellular Automaton}, author = {Luke Schaeffer}, year = {2014}, url = {http://eccc.hpi-web.de/report/2014/084}, researchr = {https://researchr.org/publication/Schaeffer14}, cites = {0}, citedby = {0}, journal = {Electronic Colloquium on Computational Complexity (ECCC)}, volume = {21}, pages = {84}, }