1. Anderson R et al (1989) Disks, balls, and walls: analysis of a combinatorial game. Am Math Mon 96:981
2. Bak P, Creutz M (1994) Fractals and self-organized criticality. In: Bunde A, Havlin S (eds) Fractals in science. Springer, Berlin, pp 26–47
3. Bak P, Tang C, Wiesenfeld K (1987) Self-organized criticality. Phys Rev Lett 59:381. (1988) Phys Rev A 38:3645
4. Bak P, Chen K, Creutz M (1989) Self-organized criticality in the ‘Game of Life’. Nature 342:780
5. Bennett C, Bourzutschy M (1991) ‘Life’ not critical? Nature 350:468