Tommaso Toffoli Silvio Capobianco Patrizia Mentrasti How to turn a second-order cellular automaton into a lattice gas: a new inversion scheme. 329-344 2004 325 Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/j.tcs.2004.06.012 db/journals/tcs/tcs325.html#ToffoliCM04