The best currently known class of dynamically equivalent cellular automata rules for density classification. - Pedro Paulo Balbi de Oliveira; José C. Bortot; Gina M. B. Oliveira (Neurocomputing, 2006)

Further Results on Multiobjective Evolutionary Search for One-Dimensional, Density Classifier, Cellular Automata, and Strategy Analysis of the Rules. - Gina M. B. Oliveira; José C. Bortot; Pedro Paulo Balbi de Oliveira (LAPTEC, 2007)