1. M. Bruschi, P. M. Santini and O. Ragnisco, Phys. Lett., 169A (1992) 151.
2. M. Bruschi and P. M. Santini, “Integrable cellular automata. II”, in preparation (1992).
3. M. Bruschi and P. M. Santini, “Integrable cellular automata in 2 + 1 dimensions”, in preparation (1992).
4. S. Wolfram, “Theory and Applications of Cellular Automata” World Scientific, Singapore (1986)
5. ; in “Scaling Phenomena in Disordered Systems, [Eds. R. Pynn and A. Skjeltorp], Plenum, New York (1985).