The best currently known class of dynamically equivalent cellular automata rules for density classification. Pedro P.B. de Oliveira, J. C. B. & Oliveira, G. M. B. Neurocomputing, 70(1--3):35--43, December, 2006.
bibtex   
@article{Oliveira06a,
   author = {Pedro P.B. de Oliveira, Jose C. Bortot and Gina M. B. Oliveira},
   title = {The best currently known class of dynamically equivalent
   cellular automata rules for density classification},
   journal = {Neurocomputing},
   volume = {70},
   number = {1--3},
   pages = {35--43},
   month = {December},
   year = {2006}
}

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