@InProceedings{boyer_et_al:LIPIcs.STACS.2009.1836,
  author =	{Boyer, Laurent and Theyssier, Guillaume},
  title =	{{On Local Symmetries and Universality in Cellular Automata}},
  booktitle =	{26th International Symposium on Theoretical Aspects of Computer Science},
  pages =	{195--206},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-09-5},
  ISSN =	{1868-8969},
  year =	{2009},
  volume =	{3},
  editor =	{Albers, Susanne and Marion, Jean-Yves},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.STACS.2009.1836},
  URN =		{urn:nbn:de:0030-drops-18369},
  doi =		{10.4230/LIPIcs.STACS.2009.1836},
  annote =	{Keywords: Cellular automata, Universality, Asymptotic density}
}