Tommaso Toffoli Silvio Capobianco Patrizia Mentrasti When-and how-can a cellular automaton be rewritten as a lattice gas? 71-88 2008 403 Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.tcs.2008.04.047 db/journals/tcs/tcs403.html#ToffoliCM08