Claudio L. M. Martins Pedro P. B. de Oliveira Improvement of a Result on Sequencing Elementary Cellular Automata Rules for Solving the Parity Problem. 103-119 2009 252 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2009.09.017 db/journals/entcs/entcs252.html#MartinsO09